SpaceX Starship development

SpaceX Starship development began in 2012, when Elon Musk, CEO of American aerospace company SpaceX, first publicly described a high-level plan to build a reusable rocket system with substantially greater capabilities than the Falcon 9 and the (then- planned) Falcon Heavy. The rocket evolved through many design and name changes. On 25 July 2019, the Starhopper prototype performed the first successful flight at SpaceX Starbase near Boca Chica, Texas.[1] The SN15 prototype rocket was the first full size test spacecraft to take off and land successfully, in May 2021.[2]

Elon Musk taking pictures of Starship SN9 in construction

History

As early as 2007, Musk stated a personal goal of eventually enabling human exploration and settlement of Mars.[3][4] SpaceX began development of the Raptor rocket engine (the engine used in Starship) before 2014. From 2011 to 2014, Musk made various statements expressing his hope that SpaceX would send humans to Mars in the 2020s to 2030s.[4][5][6][7]

Mars Colonial Transporter

In October 2012, Musk first publicly articulated a plan to build a fully reusable rocket system with substantially greater capabilities than the Falcon 9.[8] The launch vehicle was described as part of the company's Mars system architecture, then known as Mars Colonial Transporter (MCT).[5] The idea included reusable rocket engines, launch vehicles and space capsules to transport humans to Mars and return them to Earth.[9] SpaceX CEO Gwynne Shotwell mentioned that the payload could reach 150–200 tons to low Earth orbit.[8] The MCT vehicle was to be "an evolution of SpaceX's Falcon 9 booster ... much bigger [than Falcon 9]."[5][10]

In June 2013, Musk stated that he intended to defer SpaceX's IPO until after the "Mars Colonial Transporter is flying regularly."[11][12]

In February 2014, the principal payload for the MCT was announced to be a large interplanetary spacecraft, capable of carrying up to 100 tonnes (220,000 lb) of passengers and cargo.[13] According to SpaceX engine development head Tom Mueller, SpaceX could use nine Raptor engines on a single rocket, just as the Falcon 9 booster used nine Merlin engines.[14] The rocket would be at least 10 meters (33 ft) in diameter — nearly three times the diameter and over seven times the cross-sectional area of the Falcon 9 booster cores. It was expected to have up to three cores totaling at least 27 engines.[9]

Interplanetary Transport System

Interplanetary Transport System
Artist's conception of the ITS at liftoff
Function
ManufacturerSpaceX
Country of originUnited States
Size
Height122 m (400 ft)
Diameter12 m (39 ft)
Mass10,500 t (23,100,000 lb)
Stages2
Capacity
Payload to LEO
Mass300 t (660,000 lb) (reusable)
550 t (1,210,000 lb) (expendable)
Payload to Mars
Mass450 t (990,000 lb) (with refueling)
Associated rockets
Based onMars Colonial Transporter
Derivative workBig Falcon Rocket
Launch history
StatusDeveloped into the BFR
Launch sitesKSC LC-39A
First stage – ITS Booster
Height77.5 m (254 ft)
Diameter12 m (39 ft)
Empty mass275 t (606,000 lb)
Gross mass6,975 t (15,377,000 lb)
Propellant mass6,700 t (14,800,000 lb)
Powered by42 Raptor
Maximum thrust128 MN (29,000,000 lbf)
Specific impulse334 s (3.28 km/s)
PropellantSubcooled LCH4 / LOX
Second stage – ITS Tanker
Height49.5 m (162 ft)
Diameter12 m (39 ft)
17 m (56 ft) (incl. legs)
Empty mass90 t (200,000 lb)
Gross mass2,590 t (5,710,000 lb)
Propellant mass2,500 t (5,500,000 lb)
Powered by3 Raptor
6 Raptor Vacuum
Maximum thrust31 MN (7,000,000 lbf)
PropellantSubcooled LCH4 / LOX
Second stage – Interplanetary Spaceship
Height49.5 m (162 ft)
Diameter12 m (39 ft)
17 m (56 ft) (incl. legs)
Empty mass150 t (330,000 lb)
Gross mass2,100 t (4,600,000 lb)
Propellant mass1,950 t (4,300,000 lb)
Powered by3 Raptor
6 Raptor Vacuum
Maximum thrust31 MN (7,000,000 lbf)
PropellantSubcooled LCH4 / LOX

In 2016, Musk abandoned the Mars Colonial Transporter name, as the system would be able to "go well beyond Mars", in favor of Interplanetary Transport System (ITS).[15] That year he unveiled details of the space mission architecture, launch vehicle, spacecraft, and Raptor engines. The first firing of a Raptor engine occurred on a test stand in September 2016.[16][17]

In October 2016, Musk indicated that the initial prepreg carbon-fiber tank test article, built with no sealing liner, had performed well in cryogenic fluid testing. A pressure test at approximately 2/3 of the design burst pressure was completed in November 2016.[18]

In July 2017, Musk indicated that the architecture had evolved since 2016 in order to support commercial transport via Earth-orbit and cislunar launches.[19]

Design

The ITS stack was composed of two stages. The first stage was to be a launch booster, while the second stages would be either an "Interplanetary Spaceship" for crewed transport or an "ITS tanker" for orbital refueling. Both stages were to be powered by Raptors.

The Raptor was a bipropellant liquid rocket engine in a full flow staged combustion cycle, with liquid methane fuel and liquid oxygen oxidizer.[20] Both propellants would enter the combustion chamber in the gas phase.[9] A bleed-off of the high-pressure gas would provide autogenous pressurization of the propellant tanks, eliminating the Falcon 9's problematic high-pressure helium pressurization system.[21][22][16]

The overall launch vehicle height, (first and second stages), was 122 m (400 ft).[23] Both stages were to have been constructed of lightweight carbon fiber, including the deep-cryogenic propellant tanks, a major change from the Falcon 9's aluminum-lithium alloy tank and structure material. Both stages were to be fully reusable and land vertically.[21][22] Gross liftoff mass was to be 10,500 t (1,650,000 st) at a lift-off thrust of 128 meganewtons (29,000,000 lbf). ITS was to carry a payload to low Earth orbit of 550 tonnes (1,210,000 lb) in expendable-mode and 300 tonnes (660,000 lb) in reusable mode.[24]

ITS booster

The ITS booster was a 12 m-diameter (39 ft), 77.5 m-high (254 ft), reusable first stage, to be powered by 42 sea-level rated engines each producing some 3,024 kilonewtons (680,000 lbf) of thrust. Total booster thrust would have been approximately 128 MN (29,000,000 lbf) at liftoff, several times the 36 MN (8,000,000 lbf) thrust of the Saturn V.[21]

The engine configuration included 21 engines in an outer ring and 14 in an inner ring. The center cluster of seven engines was to be gimbaled for directional control, although some directional control was to be performed via differential thrust on the fixed engines. Thrust on each engine was aimed to vary between 20 and 100 percent of rated thrust.[22]

The propellants would also power the reaction control thrusters, while in the gas phase. These thrusters would control booster orientation in space, as well as improve accuracy during landing.[22]

The design goal was to achieve a separation velocity of approximately 8,650 km/h (5,370 mph) while retaining about 7% of the initial propellant to achieve a vertical landing at the launch pad.[22][25]

The design called for grid fins to guide the booster during atmospheric reentry.[22] The booster return flights were expected to encounter loads lower than the Falcon 9, principally because the ITS would have both a lower mass ratio and a lower density.[26] The booster was to be designed for 20 g nominal loads, and possibly as high as 30–40 g.[26]

In contrast to the landing approach used on SpaceX's mid-2010s reusable rocket first stages—either a large, flat concrete pad or downrange floating landing platform, the ITS booster was to designed to land on the launch mount itself, for immediate refueling and relaunch.[22]

Second stage

The ITS did not have a dedicated single-function second stage for achieving orbit. Instead, the second stage function of reaching orbit was a secondary role for a spacecraft capable of long-duration spaceflight.

The Interplanetary Spaceship was a large passenger-carrying spacecraft design proposed in September 2016. The ship would operate as a second-stage, and as an interplanetary transport vehicle for cargo and passengers. The Interplanetary Spaceship would be able to transport up to 450 tonnes (990,000 lb) per trip to Mars following refueling in Earth orbit.[21] The three sea-level Raptor engines would be used for maneuvering, descent, and landing, as well as an initial ascent from the Mars surface.[21]

The ITS tanker was a second stage propellant tanker variant. It was designed to transport up to 380 tonnes (840,000 lb) of propellants to low Earth orbit to refuel Interplanetary Spaceships. After refueling operations, it was to land and be prepared for another flight.[24]

Reusability

2016 artist's concept of ITS booster returning to the launch pad

Both stages were to be designed to be fully reusable and were to land vertically, using Falcon 9-generation technologies.[21]

Importantly, the "fully and rapidly reusable" aspect of the ITS design was the largest factor in the SpaceX analysis for reducing the cost of transporting mass to space. While the 2016-17 system under development relied on several cost-reducing elements, reusability alone was claimed to reduce that cost by approximately 2 1/2 orders of magnitude over NASA's previous missions. Musk stated that this was over half of the 4 1/2 orders of magnitude that he claimed was needed to enable a sustainable beyond-Earth settlement.[27][24]

Big Falcon Rocket

Big Falcon Rocket
2017 artist's conception of the Big Falcon Ship (BFS) with payload bay door open
Function
ManufacturerSpaceX
Country of originUnited States
Size
Height106 m (348 ft)
Diameter9 m (30 ft)
Stages2
Capacity
Payload to LEO
Mass150 t (330,000 lb) (reusable)
Associated rockets
Based onInterplanetary Transport System
Derivative workSpaceX Starship system
Launch history
StatusDeveloped into the Starship system
Launch sitesKSC LC-39A
First stage – Big Falcon Booster
Diameter9 m (30 ft)
Powered by31 Raptor
Maximum thrust62 MN (14,000,000 lbf)
PropellantSubcooled LCH4 / LOX
Second stage – Big Falcon Ship
Diameter9 m (30 ft)
Powered by2 (later 3) sea-level Raptor
4 vacuum Raptor
PropellantSubcooled LCH4 / LOX

In September 2017, at the 68th annual meeting of the International Astronautical Congress, Musk announced a new launch vehicle called the Big Falcon Rocket (BFR). He said, "we are searching for the right name, but the code name, at least, is BFR."[28] Its goal was to send two cargo missions to Mars in 2022,[29] with the goal to "confirm water resources and identify hazards" while deploying "power, mining, and life support infrastructure" for future flights. This would be followed by four ships in 2024, two crewed BFR spaceships plus two cargo-only ships carrying equipment and supplies for a propellant plant.[28]

The design balanced objectives such as payload mass, landing capabilities, and reliability. The initial design showed the ship with six Raptor engines (two sea-level, four vacuum) down from nine in the previous ITS design.[28] The engine layout, reentry aerodynamic surface designs, and even the basic material of construction each changed thereafter.

By September 2017, Raptors had been test-fired for a combined total of 20 minutes across 42 test cycles. The longest test was 100 seconds, limited by the size of the propellant tanks. The test engine operated at 20 MPa (200 bar; 2,900 psi). The flight engine aimed for 25 MPa (250 bar; 3,600 psi), on the way to 30 MPa (300 bar; 4,400 psi) in later iterations.[28] In November 2017, Shotwell indicated that approximately half of all development work on BFR was focused on the engine.[30]

SpaceX looked for manufacturing sites in California, Texas, Louisiana,[31] and Florida.[32] By September 2017, SpaceX had started building launch vehicle components: "The tooling for the main tanks has been ordered, the facility is being built, we will start construction of the first ship [in the second quarter of 2018.]"[28]

By early 2018, the first carbon composite prototype ship was under construction, and SpaceX had begun building a new production facility at the Port of Los Angeles.[33]

In March, SpaceX announced that it would manufacture its launch vehicle and spaceship at a new facility on Seaside Drive at the port.[34][35][36] By May, approximately 40 SpaceX employees were working on the BFR.[31] SpaceX planned to transport the launch vehicle by barge, through the Panama Canal, to Cape Canaveral for launch.[31]

In August 2018, the US military publicly expressed interest in using BFR. The head of USAF Air Mobility Command was specifically interested in its ability to move up to 150 t (330,000 lb) of cargo anywhere in the world in under 30 minutes, for "less than the cost of a C-5".[37][38]

Design

The BFR was106-meter (348 ft) tall, 9-meter (30 ft) in diameter, and made of carbon-fiber.[29][39]

The upper stage, known as Big Falcon Ship (BFS), included a small delta wing at the rear end with split flaps for pitch and roll control. The delta wing and split flaps were said to expand the flight envelope to allow the ship to land in a variety of atmospheric densities (vacuum, thin, or heavy atmosphere) with a wide range of payloads.[29][28]:18:05–19:25 The BFS originally had six Raptor engines, with four vacuum and two sea-level. By late 2017, SpaceX added a third sea-level engine (totaling 7) to increase engine-out capability and allow greater payload landings.[40]

Three BFS versions were described: BFS cargo, BFS tanker, and BFS crew. The cargo version would be used to reach Earth orbit[29] as well as carry cargo to the Moon or Mars. After refueling in an elliptical Earth orbit, BFS could land on the Moon and return to Earth without another refueling.[29][28]:31:50

Additionally, the BFR could theoretically carry passengers/cargo in Earth-to-Earth transport, delivering its payload anywhere within 90 minutes.[29]

Starship and Super Heavy

2018 artist's conception of the redesigned BFS/Starship at stage separation.

In 2018 Musk announced a planned 2023 lunar circumnavigation mission (#dearMoon project).[41] He showed a redesigned BFR concept with three rear fins and two front canard fins, replacing the previous delta wing and split flaps. The revised design used seven Raptor engines and had two small actuating canard fins near the nose, and three large fins at the base, two of which would actuate, with all three serving as landing legs.[42]

The two major parts were renamed to Starship (second stage) and Super Heavy (booster stage).[43] In 2019, SpaceX began to refer to the Starship/Super Heavy combination as the SpaceX Starship system.[44][45][46][47]

Stainless steel

In January 2019, Musk announced a major design change: Starship and Super Heavy would be made from stainless steel instead of carbon fiber.[48] His stated reason was that "stainless steel was "obviously cheap, it's obviously fast—but it's not obviously the lightest. But it is actually the lightest. If you look at the properties of a high-quality stainless steel, the thing that isn't obvious is that at cryogenic temperatures, the strength is boosted by 50 percent."[49] The high melting point of 300-series steel would eliminate the need for a heat shield on Starship's space-facing side, while the much hotter Earth-facing side would be cooled by allowing fuel or water to bleed through micropores in a double-wall stainless steel skin, removing heat by evaporation.

Both rockets were assemblies of vertically stacked steel cylinders (rings) welded to each other.

In 2019, the design reverted to six Raptor engines, with three optimized for sea-level and three optimized for vacuum.[50] Initial Super Heavy test flights would use fewer engines, perhaps approximately 20.[51]

Later in 2019 Musk stated that Starship was expected to have empty mass of 120,000 kg (260,000 lb) and be able to initially transport a payload of 100,000 kg (220,000 lb), growing to 150,000 kg (330,000 lb) over time. Musk hinted at an expendable variant that could place 250,000 kg into low orbit.[52]

The Raptor design was refined, higher thrust versions. The initial 37 engines were reduced to 31 in 2020.[53] Musk stated that SpaceX would complete hundreds of cargo flights before carrying human passengers.[54]

In February 2021 SpaceX completed raising US$3.5 billion in additional equity financing.[55][56] In April, SpaceX publicly forecast that Earth to Earth passenger flights would be common within five years.[56]

Atmospheric descent tests in 2020-2021 emboldened SpaceX to make Starship's body flaps narrower and lighter.[57]

Second stage prototypes

Videos of Starship flight tests
From NASASpaceFlight.com and SpaceX
Starhopper 150m hop
Starship SN5 150m hop
Starship SN8 failed 12.5km test flight
Starship SN9 failed 10km test flight
Starship SN10 failed 10km test flight
Starship SN11 failed 10km test flight
Starship SN15 10km test flight

SpaceX prototypes are subjected to many tests before one is launched. Proof pressure tests come first. The tanks are filled with a liquid or gas to test their strength and safety factor. SpaceX tests some tanks beyond the specified limit, to find the point at which they burst. The engines were tested in later prototypes, while the vehicle remained tethered to the ground (static fire). After passing these tests vehicles launch, either flying within the atmosphere, or reaching orbit.[58]:15–19

Test launches
Name First spotted[lower-alpha 1] First static fire Maiden flight Decommissioned Construction site Status Flights
Starhopper December 2018[59] 3 April 2019[60] 25 July 2019[61] August 2019[62] Boca Chica, Texas Repurposed[63][64] 2
Mk1 December 2018[65] 20 November 2019[66] Boca Chica, Texas Destroyed 0
Mk2 May 2019[67] November 2019[68][69] Cocoa, Florida Scrapped 0
Mk3/SN1 c.October 2019[70] 28 February 2020[71] Boca Chica, Texas Destroyed 0
Mk4 c.September 2019[70] November 2019[68][72] Cocoa, Florida Scrapped 0
SN3 March 2020[73] 3 April 2020[74] Boca Chica, Texas Destroyed 0
SN4 April 2020[75][76] 5 May 2020[77] 29 May 2020[78] Boca Chica, Texas Destroyed 0
SN5 April 2020[76] 27 July 2020[79] 4 August 2020[80] February 2021[81] Boca Chica, Texas Scrapped 1
SN6 May 2020[82][83] 23 August 2020[84] 3 September 2020[85] January 2021[86][81] Boca Chica, Texas Scrapped 1
SN8 July 2020[87] 20 October 2020 9 December 2020[88] 9 December 2020[88] Boca Chica, Texas Destroyed 1
SN9 August 2020[89] 6 January 2021[90] 2 February 2021[90] 2 February 2021[90] Boca Chica, Texas Destroyed 1
SN10 September 2020[91] 23 February 2021[92] 3 March 2021[93] 3 March 2021[93] Boca Chica, Texas Destroyed[lower-alpha 2] 1
SN11 September 2020[94] 22 March 2021[95] 30 March 2021[96] 30 March 2021 Boca Chica, Texas Destroyed 1
SN12 September 2020[97] February 2021[98] Boca Chica, Texas Scrapped[lower-alpha 3][98] 0
SN13 October 2020[101] February 2021[98] Boca Chica, Texas Scrapped[98] 0
SN14 October 2020[102] February 2021[98] Boca Chica, Texas Scrapped[98] 0
SN15 November 2020[103] 26 April 2021[104][105] 5 May 2021[106] 31 May 2021 Boca Chica, Texas Retired[107] 1
SN16/Ship 16 December 2020[108] 10 May 2022 Boca Chica, Texas Scrapped[109] 0
SN17 December 2020[110] May 2021 Boca Chica, Texas Scrapped[111] 0
SN18 January 2021[112] June 2021 Boca Chica, Texas Scrapped 0
SN19 February 2021[113] June 2021 Boca Chica, Texas Scrapped 0
SN20/Ship 20 March 2021[114] 21 October 2021 Boca Chica, Texas Retired[115] 0
Ship 21 3 July 2021[116] Boca Chica, Texas Scrapped 0
Ship 22 September 2021 Boca Chica, Texas Retired[117] 0
Ship 23 October 2021 Boca Chica, Texas Scrapped 0
Ship 24 November 2021 9 August 2022[118] Not yet Not yet Boca Chica, Texas At Launch Pad 0
Ship 25 March 2022 Not yet Not yet Not yet Boca Chica, Texas At the launch site 0
Ship 26 May 2022 Not yet Not yet Not yet Boca Chica, Texas Under Construction[119] 0
Ship 27 June 2022 Not yet Not yet Not yet Boca Chica, Texas Under Construction[120] 0
Ship 28 July 2022 Not yet Not yet Not yet Boca Chica, Texas Under Construction[121] 0
  1. May just be a part rather than complete vehicle.
  2. Landed successfully after 10 km test flight, but exploded during vehicle safing procedures on landing pad
  3. Never completed as flight vehicle. Repurposed as a structural testing unit in March 2021[99][100]

Starhopper

Starhopper in March 2019
Starhopper configuration as flown in August 2019

Construction on the initial steel test article—Starship Hopper,[122] Hopper, or Starhopper[123][124] began at Boca Chica in 2018. Starhopper had a single engine and was test flown to develop landing and low-altitude/low-velocity control algorithms.

Starhopper used LOX and liquid methane fuel.

Testing

It passed tanking tests, wet dress rehearsals, and pre-burner tests.[125] A storm blew over and damaged Starhopper's nose cone. SpaceX continued testing without one.[125]

It then passed a static fire test, [126] and in a tethered test reached 1 metre altitude.[127][128][125]

Mark series (Mk1 - Mk4)

SpaceX began building two high-altitude prototypes simultaneously, Mk1 in Texas and Mk2 in Florida, using competing teams that shared progress, insights, and build techniques.[129][130][127] These vehicles featured three Raptor methalox engines and were meant to reach an altitude 5 km (3.1 mi).[131][132] An Mk3 prototype began construction in late-2019.[133]

On 25 July, a Starhopper test flight reached approximately 20 m (66 ft) altitude,[134] followed by a 27 August test that rose to 150 m (490 ft)[135] and landed approximately 100 m (330 ft) from the launchpad, the Raptor's first use in flight.

Starship Mk1 in September 2019

Mk1 was 9 m (30 ft) in diameter and approximately 50 m (160 ft) tall,[133] with an empty mass of 200 t (440,000 lb). It was intended for testing flight and reentry profiles, in pursuit of a suborbital flight. When announced, it boasted three sea-level Raptors, two fins each at the front and back, and a nose cone containing cold-gas reaction control thrusters,. all of which were removed thereafter.[136][137][138]

Mk4 construction began in Florida in October,[139] but was scrapped after a few weeks.[68]

On 20 November 2019, Mk1 blew apart during a pressure test.[140][141] Mk2 was never completed.[68][69][142]

In December 2019, Musk redesignated Mk3 as Starship SN1 and predicted that minor design improvements would continue through SN20.[143] In January 2020, SpaceX performed pressurization tests in Boca Chica.[144] One test intentionally destroyed the tank by over-pressurizing it to 7.1 bar (103 psi).[145] Another tank underwent at least two pressurization tests; the first failed at 7.5 bar (109 psi).[146] After repairs the tank was cryogenic pressure tested (29 January), and ruptured at 8.5 bar (123 psi).[147] The test was considered a success as 8.5 represented a safety factor of 1.4 times the 6 bar (87 psi) operational pressure.[148][149]

SpaceX began stacking SN1 in February 2020 after successful pressurization tests on propellant tank prototypes. SN1 was destroyed during a cryogenic pressurization test (28 February) due to a design flaw in the lower tank thrust structure.[150][151]

SN3 and SN4

Static fire of SN4.

SN3 was destroyed during testing on 3 April 2020[152][74] due to a bad testing configuration.[58]

SN4 passed cryogenic pressure testing (26 April)[153] and two static fires (5 and 7 May): one tested the main tanks, while the other tested the fuel header tank.[154] After uninstalling the engine, a new cryogenic pressure test was conducted (19 May). A leak in the methane fuel piping ignited, causing significant damage to the rocket's base, destroying the control wiring.[155] SN4 was destroyed (29 May), due to a failure with the Ground Support Equipment's quick-disconnect function.[156]

SN5 and SN6

After a static fire test (30 July),[157] SN5 completed a 150-meter flight (4 August) with engine SN27.[80][158] SN6 completed a static fire (24 August) and a 150-meter hop test flight with engine SN29 (3 September).

In January 2021, SN6 was scrapped,[159] followed by SN5 in February.[160]

High-altitude test flights (SN8 - SN15)

SN8 shortly after taking off during its test flightSN1
Starship SN8 remains after it crashed to the ground
SN9 on Suborbital Pad B, with the production facility in the background.

SN8 and SN9

SN8 was planned to be built out of 304L stainless steel,[161] although some parts may have used 301 steel.[162] In late October and November, SN8 survived four static fires. During the third test (12 November), debris from the pad caused the vehicle to lose pneumatics.[163] Launch took place on 9 December. Launch, ascent, reorientation, and controlled descent were successful, but low pressure in the methane header tank[164] kept the engines from producing enough thrust for the landing burn, destroying SN8 on impact.[165]

On 11 December, the stand beneath SN9 failed, causing the vehicle to tip and contact the walls inside the High Bay.[166] SN9 then required a replacement forward flap.[167] SN9 conducted 6 static fires in January 2021,[90] including three separate static fires.[168] Engines 44 and 46 had to be replaced.[169] After struggling to gain FAA permission,[170] SN9 conducted a 10 km (6.2 mi) flight test (2 February). Ascent, engine cutoffs, reorientation and controlled descent were stable, but one engine's oxygen pre-burner failed, sending SN9 crashing into the landing pad.[171] The landing pad was then reinforced with an additional layer of concrete.[172] After the SN9 failure, all three engines were used to perform the belly flop landing sequence. This offered a failsafe should one fail to ignite.[173][98]

SN10 - SN14

SN10's first cryogenic proof test succeeded (8 February), followed by a static fire (23 February).[92] After an engine swap came another static fire (25 February).[174]

Two launch attempts were conducted on 3 March. The first attempt was automatically aborted after one engine produced too much thrust while throttling up. After a 3-hour delay to increase the tolerance,[175] the second attempt landed without exploding. The test ended with a hard landing-at 10 m/s-most likely due to partial helium ingestion from the fuel header tank. Three landing legs were not locked in place, producing a slight lean after landing. Although the vehicle initially remained intact, the impact crushed the legs and part of the leg skirt. Eight minutes later the prototype exploded.[176][177]

SN11 accomplished a cryogenic proof test (12 March) that included a test of the Reaction Control System (RCS),[178][179] followed by a static fire test (15 March). Immediately after ignition, the test was aborted.[180] Another static fire attempt[181] led to reports that one of the three engines had been removed for repairs.[182] A replacement engine was installed[183] and a third static fire was attempted (26 March ).[184] A 10 km flight test was conducted in heavy fog (30 March). The test included engine cutoffs, flip maneuver, flap control and descent, along with a visible fire on engine 2[185] during the ascent. Just after the defective engine was re-ignited for the landing burn, SN11 lost telemetry at T+ 5:49 and disintegrated.[186] SN12 through SN14 never launched.[187]

SN15 - SN19

SN15 introduced[188] improved avionics software, an updated aft skirt propellant architecture, and a new Raptor design and configuration.[189] A Starlink antenna on the side of the vehicle was another new feature.[190] SN15 underwent an ambient temperature pressure test (9 April),[191] A cryogenic proof test (12 April), and a header tank cryogenic proof test (13 April).[192][193] Then a static fire (26 April)[104][105] and a header tank static fire (27 April) followed.[194] A 10 km (33,000 ft) high-altitude flight test was conducted in overcast weather on 5 May, achieving a soft touchdown. A small fire near the base was controlled shortly after landing.[195] After its engines were removed, it was retired on 31 May, the first Starship prototype to fly, land and be recovered. It took its place in the now called Rocket Garden.[196] SN16[111] and SN17 were scrapped, and SN18 and SN19 were never completed.

SN20/Ship 20 - Ship 23

SN20 getting its heat shield inspected
Static fire test of SN20 on 21 November 2021

SN20 (Ship 20), is planned to be launched atop the Super Heavy booster. SN20's thermal protection system covers much of the vehicle.

SN20 rolled out to the launch mount on 5 August 2021 and was the first to be stacked on a booster. It used Booster 4 for a fit test.[114][197][198] FCC filings in May 2021 by SpaceX stated that the orbital flight would launch from Boca Chica. After separation, Starship would enter orbit and around 90 minutes later attempt a soft ocean landing around 100 km off the coast of Kauai.[199]

Ship 21 was scrapped, Ship 22 moved out to the Rocket Garden in late February 2022. Ship 23 was scrapped and partially recycled in Ship 24 which was targeted for an orbital flight as of September 2022.[200]

Ship 24

Ship 24 is currently planned to make an orbital test flight atop Booster 7.[201] It was first spotted in November 2021, and made cryogenic proof tests on 2, 6, and 7 June 2022. Starship 24 then conducted spin prime tests on 18, 20, and 21 July 2022, with an additional one on 8 August 2022. It was static fired on with two engines on 9 August 2022.[202] On 8 September 2022, SN24 underwent a static fire test where all six of its engines; three atmospheric and vacuum engines, endured an 8 second test. The test damaged/destroyed around 30 of its 25,000 ceramic tiles.[203] The ship went through repairs and is now stacked on top of Booster 7 ahead of wet dress rehearsal and first orbital flight.[204][205]

Super Heavy prototypes

Booster 4 in the High Bay
Name First spotted[lower-alpha 1] First static fire Maiden flight Decommissioned Construction site Status Flights
BN1[206] September 2020[207] [208] [208] 30 March 2021[208] Boca Chica, Texas Scrapped[209][210] 0
BN3/B3 March 2021[211][212] 19 July 2021[213] 14 August 2021 Boca Chica, Texas Scrapped[214] 0
B4 3 July 2021[215] 25 March 2022 Boca Chica, Texas Retired[117] 0
B5 19 July 2021[216] December 2021 Boca Chica, Texas Scrapped 0
B7 29 September 2021 9 August 2022[217] Not yet Not yet Boca Chica, Texas At launch pad 0
B8 6 October 2021[218] Not yet Not yet Not yet Boca Chica, Texas At the launch site 0
B9 24 October 2021 Not yet Not yet Not yet Boca Chica, Texas Under Construction[219] 0
B10 3 August 2022 Not yet Not yet Not yet Boca Chica, Texas Under Construction[220] 0
  1. The date of the first part for the booster being spotted

Boosters do not have an engine skirt. Without engines, boosters are about 3 meters shorter.[221]

BN1

BN1 was the first Super-Heavy Booster prototype, a pathfinder that was not intended for flight tests.[222] Sections of the ~70 m (230 ft) tall test article were manufactured throughout the fall. Section stacking began in December 2020.[223] BN1 was fully stacked inside the High Bay on 18 March.[224] On 30 March 2021, BN1 was scrapped.

BN3/B3

BN3 (Booster 3)[225] was used for ground tests. A cryogenic proof test was completed (13 July).[226][227] Booster 3 completed stacking in the High Bay (29 June),[228] and moved to the test pad without engines.[229] Three engines were subsequently added.[230]

A static fire test was conducted 19 July.[213] BN3/Booster 3 was partially scrapped on 15 August, while the LOX tank remained welded to the Test Stand.[214] The LOX tank was taken off the Test Stand on the 13th January 2022.[231]

B4

Booster 4 first became visible on 3 July. Musk ordered several hundred SpaceX employees at Hawthorne to relocate to Boca Chica to accelerate the development of SN20, BN4, and the Orbital Launch Platform[230] in an attempt to put the Starship system on the pad by 5 August.[232] BN4 was fully stacked on 1 August, with a full complement of 29 engines[233] installed on 2 August. Grid fins were added to support atmospheric reentry testing, but notably, the grid fins on the Booster 4 test article did not fold down for launch.[230]

SN20 was stacked on top of Booster 4 on 6 August for a fitting test, making it the largest rocket ever.[234] Booster 4 was then returned to the High Bay for secondary wiring. On 9 September, Booster 4 came again to the launch site on top of the Orbital Launch mount.[235]

B4 completed its first cryogenic proof test (17 December),[236] and a pneumatic proof test (19 December). It underwent another cryogenic proof test and a full-load cryogenic proof test. B4 and Ship 20 were then retired.[227]

B5

Parts for B5 were observed as early as 19 July.[216] Stacking for BN5 completed in November, although on 8 December, B5 retired to stand alongside SN15 and SN16.

B7

Parts for B7 were spotted on 29 September. B7 was placed on the orbital launch mount on 31 March 2022. After completing a cryogenic proof test on 4 April 2022, it was placed onto the new booster test stand on 8 April. B7 completed another cryogenic test on 14 April, but the downcomer suffered a failure and ruptured. On 18 April, B7 returned to the production site for repairs. On 5 May, B7 was again placed on the orbital launch mount. B7 then completed two cryogenic tests on 9 and 11 May. It then entered the new Mega Bay (also known as Wide Bay or High Bay 2), for repairs and additional equipment, upgraded grid fins and engines, and two more 'chines' (triangular structures placed on the aft section to aid in aerodynamic control).

B7 went through more testing (11 July) where it experienced an anomaly and a small explosion.[237] The booster then rolled back to the Mega Bay.[238] B7 was transported back to the orbital launch pad with 20 outer raptor engines (August 4 to August 5)[239] and completed its first single engine static fire test (August 9). B7 completed a 20-second static fire (August 11), the longest static fire on a Starship prototype to date.[240] Following a successful set of tests, it returned to the production site to receive the remaining 13 engines.[241] B7 was lifted back onto the launch mount using the chopsticks catching system (23 August).[242] It underwent further testing including its 13 inner engines (26 August). B7 completed a multi-engine static fire (31 August).[243] This was followed by multiple spin prime tests,[244][245][246] and a seven-engine static fire on 19 September.[246] B7 again returned to the production site on 21 September.[247] After upgrades it was again lifted on the launch pad (8 October).[248]

B8

The first part of the booster, the engine thrust puck, was spotted on October 6, 2021. Other parts for B8 were observed on February 3.[249] The booster was fully stacked on July 8.[250] It travelled to the launch site on 19 September 2022.[251]

Test tanks

Starship test tanks
Name First spotted Decommissioned Construction site Cur. location Status Tests
TT1 January 2020[252] 10 January 2020[253] Boca Chica, Texas Intentionally destroyed[253] 1
LOX HT January 2020[254] 25 January 2020[255] Boca Chica, Texas Intentionally destroyed[255] 2
TT2 January 2020[256] 29 January 2020[257] Boca Chica, Texas Intentionally destroyed[257] 2
SN2 February 2020[258] March 2020[259] Boca Chica, Texas production site Retired[259] 1
SN7 May 2020[260] 23 June 2020[261] Boca Chica, Texas Intentionally destroyed[261] 2
SN7.1 July 2020[161] 22 September 2020[262] Boca Chica, Texas Intentionally destroyed[262] 2
SN7.2 December 2020[263] 22 May 2021 Boca Chica, Texas production site Retired 2
BN2.1[264] 3 June 2021[265] 25 June 2021 Boca Chica, Texas production site Retired 2
GSE 4.1 August 2021 18 January 2022 Boca Chica, Texas Intentionally destroyed[266] 2
B2.1 October 2021 6 December 2022 Boca Chica, Texas production site Retired 3
B7.1 2022 Not yet Boca Chica, Texas Massey's Potentially retired 6
EDOME 2022 Late October 2022 Boca Chica, Texas Massey's Intentionally destroyed 2

    General test tanks

    Test Tank 1 (TT1) was a subscale test tank consisting of two forward bulkheads connected by a small barrel section. TT1 was used to test new materials and construction methods. On 10 January 2020, TT1 was filled with water and tested to failure as part of an ambient temperature test, reaching a pressure of 7.1 bar (103 psi).[253]

    Liquid Oxygen Header Test Tank (LOX HTT) was similar to TT1, but was based on the LOX Header tank inside a nosecone section. On 24 January 2020, the tank underwent a pressurization test which lasted several hours.[267] The following day it was tested to destruction.[255]

    Test Tank 2 (TT2) was another subscale test tank similar to TT1. On 27 January 2020, TT2 underwent an ambient temperature pressure test where it reached a pressure of 7.5 bar (109 psi) before a leak occurred.[146] Two days later, it underwent a cryogenic proof test to destruction, bursting at 8.5 bar (123 psi).[268][257]

    EDOME is a test tank created to test flatter domes, possibly used on future Starship prototypes. It was moved to the launch site in July 2022, and back to the production site the next month, and never received testing. It was later moved from the production site to the new Masseys site on 22 September 2022, which conducts non-flight hardware testing. On 30 September 2022, it burst during a cryogenic pressure test to failure. After repairs, it was tested to destruction in late October 2022.

    Starship-based test tanks

    SN2 was a half-size test tank used to test welding quality and thrust puck design. The thrust puck is found on the bottom of the vehicle where in later Starship tests up to three sea-level Raptor engines would be mounted. SN2 passed a pressure test on 8 March 2020.[151][150]

    SN7 was a pathfinder test article for the switch to type 304L stainless steel.[161] A cryogenic proof test was performed on 15 June 2020, achieving a pressure of 7.6 bar (110 psi) before a leak occurred. During a pressurize to failure test on 23 June 2020, the tank burst at an unknown pressure.[269][261]

    SN7.1 was the second 304L test tank, with the goal of reaching a higher failure pressure.[161] The tank was repeatedly tested in September, and tested to destruction on 23 September.[270] The bulkhead came apart at a pressure of 8 bar (115 psi) in ullage and 9 bar (130 psi) at base.[271][262]

    SN7.2 was created to test thinner walls, and therefore, lower mass. It is believed to be constructed from 3 mm steel sheets rather than the 4 mm thickness of its predecessors.[272] On 26 January 2021, SN7.2 passed a cryogenic proof test. On 4 February, during a pressurize to failure test, the tank developed a leak.[273][98] On 15 March, SN7.2 was retired.[274][275]

    Super Heavy-based test tanks

    BN2.1 was rolled out on 3 June 2021[265] for cryogenic tests (8 June)[276] and (17 June).[277]

    B2.1 (not BN2.1) survived three cryogenic tests on on 1, 2, and 3 December.[278][279]

    B7.1 was first cryogenically proof tested on 28 June 2022,[280] and tested again on 19 July 2022.[281] During a suspected pressurize to failure test two days later, it received minor damage.[282] After repairs, it underwent a fourth cryogenic proof test (27 July), a fifth (1 September), and a sixth five days later. It then rolled back to the production site (16 September). B7.1 left the production site (22 September) to head to the new Masseys site.[1]

    GSE-based test tanks

    GSE 4.1 was first spotted in August 2021, and was the first GSE test tank built, made from parts of GSE 4. It underwent a cryogenic proof test (23 August) before it was rolled to Sanchez site.[283] It was rolled back to the launch site in November 2021 and underwent an apparent cryogenic proof test to failure (18 January), where it burst at an unknown pressure.[266]

    See also

    • Launch vehicle system tests
    • List of SpaceX Starship flight tests
    • SpaceX Mars program

    References

    1. Tariq Malik (26 July 2019). "SpaceX Starship Prototype Takes 1st Free-Flying Test Hop". Space.com. Retrieved 24 January 2022.
    2. Roulette, Joey (5 May 2021). "SpaceX successfully landed a Starship prototype for the first time". The Verge. Retrieved 24 January 2022.
    3. Hoffman, Carl (22 May 2007). "Elon Musk Is Betting His Fortune on a Mission Beyond Earth's Orbit". Wired Magazine. Archived from the original on 14 November 2012. Retrieved 14 March 2014.
    4. "Elon Musk: I'll Put a Man on Mars in 10 Years". Market Watch. New York. 22 April 2011. Archived from the original on 2 September 2011. Retrieved 1 December 2011.
    5. "Huge Mars Colony Eyed by SpaceX Founder". Discovery News. 13 December 2012. Archived from the original on 15 November 2014. Retrieved 25 September 2016.
    6. Carroll, Rory (17 July 2013). "Elon Musk's mission to Mars". TheGuardian. Archived from the original on 8 January 2014. Retrieved 25 September 2016.
    7. Messier, Doug (5 February 2014). "Elon Musk Talks ISS Flights, Vladimir Putin and Mars". Parabolic Arc. Archived from the original on 16 September 2018. Retrieved 25 September 2016.
    8. Rosenberg, Zach (15 October 2012). "SpaceX aims big with massive new rocket". Flight Global. Archived from the original on 3 July 2015. Retrieved 25 September 2016.
    9. Belluscio, Alejandro G. (7 March 2014). "SpaceX advances drive for Mars rocket via Raptor power". NASASpaceFlight.com. Archived from the original on 11 September 2015. Retrieved 25 September 2016.
    10. Coppinger, Rod (23 November 2012). "Huge Mars Colony Eyed by SpaceX Founder Elon Musk". Space.com. Archived from the original on 28 June 2013. Retrieved 25 September 2016. an evolution of SpaceX's Falcon 9 booster ... much bigger [than Falcon 9], but I don’t think we’re quite ready to state the payload. We’ll speak about that next year. ... Vertical landing is an extremely important breakthrough — extreme, rapid reusability.
    11. Schaefer, Steve (6 June 2013). "SpaceX IPO Cleared For Launch? Elon Musk Says Hold Your Horses". Forbes. Archived from the original on 6 March 2017. Retrieved 10 June 2013.
    12. Ciaccia, Chris (6 June 2013). "SpaceX IPO: 'Possible in the Very Long Term'". The Street. Archived from the original on 10 June 2013. Retrieved 10 June 2013.
    13. Heath, Chris (12 December 2015). "How Elon Musk Plans on Reinventing the World (and Mars)". GQ. Archived from the original on 12 December 2015. Retrieved 25 September 2016.
    14. Nellis, Stephen (19 February 2014). "SpaceX's propulsion chief elevates crowd in Santa Barbara". Pacific Coast Business Times. Archived from the original on 26 September 2016. Retrieved 25 September 2016.
    15. Berger, Eric (18 September 2016). "Elon Musk scales up his ambitions, considering going "well beyond" Mars". Ars Technica. Archived from the original on 20 September 2016. Retrieved 19 September 2016.
    16. Belluscio, Alejandro G. (3 October 2016). "ITS Propulsion – The evolution of the SpaceX Raptor engine". NASASpaceFlight.com. Archived from the original on 22 November 2018. Retrieved 3 October 2016.
    17. 2016 StartmeupHK Venture Forum - Elon Musk on Entrepreneurship and Innovation. StartmeupHK Venture Forum--2016. via InvestHK YouTube channel: Invest Hong Kong. 26 January 2016. Archived from the original on 28 January 2016. Retrieved 28 January 2016. (SpaceX discussion at 30:15-31:40) We'll have the next generation rocket and spacecraft, beyond the Falcon and Dragon series ... I'm hoping to describe that architecture later this year at the International Astronautical Congress. which is the big international space event every year. ... first flights to Mars? we're hoping to do that in around 2025 ... nine years from now or thereabouts.
    18. Mosher, Dave (17 November 2016). "The 'trickiest' part of Elon Musk's Mars spaceship -- a giant black orb -- just passed a critical test". Business Insider. Archived from the original on 17 November 2016. Retrieved 18 November 2016.
    19. Elon Musk (19 July 2017). Elon Musk, ISS R&D Conference (video). ISS R&D Conference, Washington DC, USA. Event occurs at 49:48–51:35. Retrieved 13 September 2017 via YouTube. the updated version of the Mars architecture: Because it has evolved quite a bit since that last talk. ... The key thing that I figured out is how do you pay for it? If we downsize the Mars vehicle, make it capable of doing Earth-orbit activity as well as Mars activity, maybe we can pay for it by using it for Earth-orbit activity. That is one of the key elements in the new architecture. It is similar to what was shown at IAC, but a little bit smaller. Still big, but this one has a shot at being real on the economic front.
    20. Bergin, Chris (11 May 2015). "Falcon Heavy enabler for Dragon solar system explorer". NASASpaceFlight.com. Archived from the original on 13 May 2015. Retrieved 12 May 2015.
    21. Bergin, Chris (27 September 2016). "SpaceX reveals ITS Mars game changer via colonization plan". NASASpaceFlight.com. Archived from the original on 28 September 2016. Retrieved 27 September 2016.
    22. Richardson, Derek (27 September 2016). "Elon Musk Shows Off Interplanetary Transport System". Spaceflight Insider. Archived from the original on 1 October 2016. Retrieved 3 October 2016.
    23. Musk, Elon [@elonmusk] (27 September 2016). "12m rocket booster diameter, 17m spaceship diameter, 122 m stack height" (Tweet). Retrieved 22 August 2021 via Twitter.
    24. "Making Humans a Multiplanetary Species" (PDF). SpaceX. 27 September 2016. Archived (PDF) from the original on 20 November 2017. Retrieved 10 November 2018.
    25. Berger, Eric (28 September 2016). "Musk's Mars moment: Audacity, madness, brilliance—or maybe all three". Ars Technica. Archived from the original on 13 October 2016. Retrieved 13 October 2016.
    26. Boyle, Alan (23 October 2016). "SpaceX's Elon Musk geeks out over Mars interplanetary transport plan on Reddit". GeekWire. Archived from the original on 24 October 2016. Retrieved 24 October 2016.
    27. Elon Musk (27 September 2016). Making Humans a Multiplanetary Species (video). IAC67, Guadalajara, Mexico: SpaceX. Event occurs at 9:20–10:10. Archived from the original on 10 October 2016. Retrieved 10 October 2016. So it is a bit tricky. Because we have to figure out how to improve the cost of the trips to Mars by five million percent ... translates to an improvement of approximately 4 1/2 orders of magnitude. These are the key elements that are needed in order to achieve a 4 1/2 order of magnitude improvement. Most of the improvement would come from full reusability—somewhere between 2 and 2 1/2 orders of magnitude—and then the other 2 orders of magnitude would come from refilling in orbit, propellant production on Mars, and choosing the right propellant.{{cite AV media}}: CS1 maint: location (link)
    28. Making Life Multiplanetary. SpaceX. 29 September 2017. Archived from the original on 19 August 2021. Retrieved 22 August 2021 via YouTube.
    29. Musk, Elon (1 March 2018). "Making Life Multi-Planetary". New Space. 6 (1): 2–11. Bibcode:2018NewSp...6....2M. doi:10.1089/space.2018.29013.emu.
    30. Henry, Caleb (21 November 2017). "SpaceX aims to follow a banner year with an even faster 2018 launch cadence". SpaceNews. Retrieved 15 January 2018. Shotwell estimated that around 50 percent of the work on BFR is focused on the Raptor engines.
    31. Masunaga, Samantha (19 April 2018). "SpaceX gets approval to develop its BFR rocket and spaceship at Port of Los Angeles". Los Angeles Times. Archived from the original on 21 April 2018. Retrieved 21 April 2018.
    32. Michael DiBernardo (19 April 2018). Port Authority of Los Angeles, Regular Board Meeting (video). LA: The Port of Los Angeles. Event occurs at 35:36. Archived from the original on 22 April 2018. Retrieved 21 April 2018 via YouTube.
    33. Foust, Jeff (12 March 2018). "Musk reiterates plans for testing BFR". SpaceNews. Retrieved 15 March 2018. Construction of the first prototype spaceship is in progress. 'We're actually building that ship right now,' he said. 'I think we'll probably be able to do short flights, short sort of up-and-down flights, probably sometime in the first half of next year.'
    34. Berger, Eric (19 March 2018). "SpaceX indicates it will manufacture the BFR rocket in Los Angeles". Ars Technica. Archived from the original on 21 March 2018. Retrieved 21 March 2018.
    35. "Fireside Chat with SpaceX President Gwynne Shotwell". Flickr.com. 11 October 2017. Archived from the original on 5 April 2019. Retrieved 7 March 2018.
    36. Seemangal, Robin (1 February 2018). "SpaceX Gears Up to Finally, Actually Launch the Falcon Heavy". Wired. Archived from the original on 25 February 2018. Retrieved 7 March 2018. SpaceX is actively considering expanding its San Pedro, California facility to begin manufacturing its interplanetary spacecraft. This would allow SpaceX to easily shift personnel from headquarters in Hawthorne.
    37. Insinnia, Valerie (2 August 2018). "One possible job for SpaceX's BFR rocket? Taking the Air Force's cargo in and out of space". DefenseNews. Retrieved 9 June 2019.
    38. Air Mobility Command Chief Looks Toward Supplying Forces From Space Archived 9 June 2019 at the Wayback Machine, US Department of Defense, 2 August 2018.
    39. Foust, Jeff (29 September 2017). "Musk unveils revised version of giant interplanetary launch system". SpaceNews. Retrieved 1 October 2017.
    40. Foust, Jeff (15 October 2017). "Musk offers more technical details on BFR system". SpaceNews. Retrieved 27 May 2019. [Musk] added that, since the presentation last month, SpaceX has revised the design of the BFR spaceship to add a "medium area ratio" Raptor engine to its original complement of two engines with sea-level nozzles and four with vacuum nozzles. That additional engine helps enable that engine-out capability ... and will "allow landings with higher payload mass for the Earth to Earth transport function."
    41. "Elon Musk Says SpaceX Will Send Yusaku Maezawa (and Artists!) to the Moon". Wired. 18 September 2018. Archived from the original on 16 July 2019. Retrieved 27 May 2019.
    42. Ralph, Eric (14 September 2018). "SpaceX has signed a private passenger for the first BFR launch around the Moon". Archived from the original on 14 September 2018. Retrieved 14 September 2018.
    43. Boyle, Alan (19 November 2018). "Goodbye, BFR … hello, Starship: Elon Musk gives a classic name to his Mars spaceship". GeekWire. Archived from the original on 22 November 2018. Retrieved 22 November 2018. Starship is the spaceship/upper stage & Super Heavy is the rocket booster needed to escape Earth's deep gravity well (not needed for other planets or moons)
    44. "Starship". SpaceX. Archived from the original on 30 September 2019. Retrieved 30 September 2019.
    45. "Starship Users Guide, Revision 1.0, March 2020" (PDF). SpaceX. March 2020. Archived (PDF) from the original on 2 April 2020. Retrieved 18 May 2020. SpaceX's Starship system represents a fully reusable transportation system designed to service Earth orbit needs as well as missions to the Moon and Mars. This two-stage vehicle – composed of the Super Heavy rocket (booster) and Starship (spacecraft)
    46. berger, Eric (5 March 2020). "Inside Elon Musk's plan to build one Starship a week and settle Mars". Ars Technica. Archived from the original on 5 March 2020. Retrieved 6 March 2020. Musk tackles the hardest engineering problems first. For Mars, there will be so many logistical things to make it all work, from power on the surface to scratching out a living to adapting to its extreme climate. But Musk believes that the initial, hardest step is building a reusable, orbital Starship to get people and tons of stuff to Mars. So he is focused on that.
    47. Berger, Eric (29 September 2019). "Elon Musk, Man of Steel, reveals his stainless Starship". Ars Technica. Archived from the original on 28 December 2019. Retrieved 30 September 2019.
    48. D'Agostino, Ryan (22 January 2019). "Elon Musk: Why I'm Building the Starship out of Stainless Steel". Popular Mechanics. Retrieved 30 May 2019.
    49. D'Agostino, Ryan (22 January 2019). "Elon Musk: Why I'm Building the Starship out of Stainless Steel". popularmechanics.com. Popular Mechanics. Archived from the original on 22 January 2019. Retrieved 22 January 2019.
    50. Musk, Elon [@elonmusk] (23 May 2019). "3 sea level optimized Raptors, 3 vacuum optimized Raptors (big nozzle)" (Tweet) via Twitter.
    51. Musk, Elon [@elonmusk] (23 May 2019). "First flights would have fewer, so as to risk less loss of hardware. Probably around 20" (Tweet) via Twitter.
    52. Musk, Elon [@elonmusk] (6 August 2021). "@NASASpaceflight @BBCAmos Over time, we might get orbital payload up to ~150 tons with full reusabity. If Starship then launched as an expendable, payload would be ~250 tons. What isn't obvious from this chart is that Starship/Super Heavy is much denser than Saturn V." (Tweet). Archived from the original on 14 August 2021. Retrieved 22 August 2021 via Twitter.
    53. Musk, Elon [@elonmusk] (3 May 2020). "@Kristennetten A little. Will have 31 engines, not 37, no big fins and legs similar to ship. That thrust dome is the super hard part. Raptor SL thrust starts at 200 ton, but upgrades in the works for 250 ton" (Tweet). Archived from the original on 3 July 2021. Retrieved 22 August 2021 via Twitter.
    54. Sheetz, Michael (1 September 2020). "Elon Musk says SpaceX's Starship rocket will launch "hundreds of missions" before flying people". CNBC. Archived from the original on 2 September 2020. Retrieved 7 February 2021.
    55. "Elon Musk's SpaceX raises $1.9 billion in funding". Reuters. Archived from the original on 20 August 2020. Retrieved 15 April 2021.
    56. Foust, Jeff (15 April 2021). "SpaceX adds to latest funding round". SpaceNews. Retrieved 15 April 2021.
    57. Musk, Elon [@elonmusk] (22 July 2021). "@AlexSvanArt @Neopork85 Flight tests showed that we could make body flaps narrower & lighter" (Tweet). Archived from the original on 20 August 2021. Retrieved 22 August 2021 via Twitter.
    58. "Starship SN3 failure due to bad commanding. SN4 already under construction". NASASpaceFlight.com. 5 April 2020. Retrieved 19 April 2020.
    59. "SpaceX CEO Elon Musk teases new Starship photos and "heavy metal" BFR". 9 December 2018.
    60. Berger, Eric (5 April 2019). "SpaceX's Starhopper vehicle test-fires its engine for the first time". arstechnica.
    61. Wall, Mike (27 August 2019). "SpaceX Starhopper Rocket Prototype Aces Highest (and Final) Test Flight". space.com.
    62. @elonmusk (20 August 2019). "Will be converted to Raptor vertical test stand" (Tweet) via Twitter.
    63. "SpaceX may 'cannibalize' its first Mars rocket-ship prototype in Elon Musk's race to launch Starship". Business Insider. 7 August 2019.
    64. "Application for new or modified radio station under FCC rules". 4 June 2020.
    65. @elonmusk (22 December 2018). "We're building subsections of the Starship Mk I orbital design there" (Tweet) via Twitter.
    66. Berger, Eric (21 November 2019). "SpaceX has lost its first Starship prototype—is this a big deal?". arstechnica.
    67. @elonmusk (15 May 2019). "SpaceX is doing simultaneous competing builds of Starship in Boca Chica Texas & Cape Canaveral Florida" (Tweet) via Twitter.
    68. "SpaceX Starship hardware mystery solved amid reports of Florida factory upheaval". 2 December 2019.
    69. Ralph, Eric (17 July 2020). "SpaceX scraps Florida Starship Mk2 prototype". TESLARATI. Retrieved 4 September 2020.
    70. Ralph, Eric (18 October 2019). "SpaceX's fourth Starship prototype has begun to take shape in Florida". Retrieved 4 April 2020.
    71. SpaceX Boca Chica - Starship SN1 cryo proof test failure - Feb 28, 2020. NASASpaceflight. 29 February 2020. Archived from the original on 9 August 2021. Retrieved 22 August 2021 via YouTube.
    72. "SpaceX expediting Mk3 construction in Texas, pausing Florida-based Starship builds". 3 December 2019.
    73. SpaceX Boca Chica - Starship SN3 exits high-bay ahead of roll to the pad. NASASpaceflight. 29 March 2020. Archived from the original on 13 February 2021. Retrieved 22 August 2021 via YouTube.
    74. Berger, Eric (3 April 2020). "SpaceX loses its third Starship prototype during a cryogenic test". arstechnica.
    75. "Starship SN3 failure due to bad commanding. SN4 already under construction". 5 April 2020.
    76. "SpaceX Starship factory speeding towards Elon Musk's production goals". 2 April 2020.
    77. Wall, Mike (6 May 2020). "SpaceX's Starship SN4 prototype fires rocket engine for 1st time". Space.com.
    78. Thompson, Amy (29 May 2020). "SpaceX Starship SN4 prototype explodes in dramatic fireball". www.teslarati.com.
    79. Bergin, Chris (27 July 2020). "Starship SN5 completes successful Static Fire test". nasaspaceflight.com.
    80. Baylor, Michael (3 August 2020). "Starship SN5 conducts successful 150-meter flight test". NASASpaceFlight. Retrieved 6 August 2020.
    81. Bergin, Chris (7 February 2021). "Starship SN10's Raptors installed as testing begins". NasaSpaceFlight. RIP SN5 workers began cutting into the SN5 sections
    82. @fael097 (11 May 2020). "SN6's fwd dome sleeved Awesome pictures by Mary aka @BocaChicaGal" (Tweet) via Twitter.
    83. "SpaceX set for a swift return to testing following Starship SN4 anomaly". 5 June 2020.
    84. Bergin, Chris (17 August 2020). "Starship SN6 fires up Raptor SN29". nasaspaceflight.com.
    85. Malik, Tariq (3 September 2020). "SpaceX launches Starship SN6 prototype test flight on heels of Starlink mission". space.com.
    86. "Up close and personal with SN6 as it gets dismantled". 7 January 2021.
    87. "Starship SN5 completes successful Static Fire test". 27 July 2020.
    88. Ralph, Eric (10 December 2020). "SpaceX Starship nails 'flip' maneuver in explosive landing video". www.teslarati.com.
    89. "Starship SN6 fires up Raptor SN29". 23 August 2020.
    90. Baylor, Michael. "Starship SN9 History". nextspaceflight.com. Retrieved 29 January 2021.
    91. SpaceX Boca Chica - Starship SN10 parts arriving as SN6 looks forward to hop (YouTube). 3 September 2020. Retrieved 13 February 2021.
    92. Ralph, Eric (23 February 2021). "SpaceX Starship static fire bodes well for a launch later this week". www.teslarati.com.
    93. Mike, Wall (3 March 2021). "SpaceX's SN10 Starship prototype lands after epic test launch — but then explodes". space.com.
    94. SpaceX Boca Chica - SN11 Parts Spotted (YouTube). 9 September 2020. Retrieved 13 February 2021.
    95. Bergin, Chris (3 July 2021). "Booster 3 opens Super Heavy test campaign as orbital vehicles prepare to stack". NASASpaceFlight.com. Retrieved 14 July 2021.
    96. "SpaceX launches Starship SN11 rocket prototype, but misses landing". Space.com. 31 March 2021.
    97. SpaceX Boca Chica - SN5 and SN6 Moved Outside - SN12 Leg Skirt (30 September) (YouTube). 1 October 2020. Retrieved 13 February 2021.
    98. Bergin, Chris (7 February 2021). "Starship SN10's Raptors installed ahead of testing and refined landing attempt". NASASpaceFlight.com. Retrieved 8 February 2021.
    99. @RGVarialphotos (11 April 2021). "New addition to nose cone structure, hexagram will be placed on top" (Tweet) via Twitter.
    100. @BocaChicaGal (13 April 2021). "Another section has been attached to the top of the nosecone testing rig" (Tweet) via Twitter.
    101. SpaceX Boca Chica - Starship SN13 exists as SN8 readies for the big day. NASASpaceFlight (YouTube). 20 October 2020. Retrieved 13 February 2021.
    102. SpaceX Boca Chica - Starship SN14 parts arrive. NASASpaceFlight (YouTube). 10 October 2020. Retrieved 13 February 2021.
    103. SpaceX Boca Chica - Starship SN15 appears amid SN11 Stacking and Lunar Mock Up outfitting. NASASpaceFlight (YouTube). 18 November 2020. Retrieved 13 February 2021.
    104. @NASASpaceflight (26 April 2021). "STATIC FIRE!" (Tweet) via Twitter.
    105. @elonmusk (27 April 2021). "Starship SN15 static fire completed, preparing for flight later this week" (Tweet) via Twitter.
    106. "SpaceX Starship prototype makes clean landing". BBC. 6 May 2021.
    107. "SpaceX's first flight-proven Starship rolled back to factory for likely retirement". 27 May 2021.
    108. Starship SN16 Fully Stacked | SpaceX Boca Chica. NASASpaceFlight (YouTube). 4 December 2020. Retrieved 13 February 2021.
    109. SpaceX Tests Water Deluge for Upcoming Static Fire | Starship Boca Chica, retrieved 11 August 2022
    110. SpaceX Boca Chica: From Super Heavy to Starship SN17 - new vehicles point to exciting future. NASASpaceFlight (YouTube). 17 December 2020. Retrieved 26 January 2021.
    111. Bergin, Chris (6 June 2021). "OLS grows ahead of Super Heavy debut – Raptor test capacity increases". NASASpaceFlight. Retrieved 6 June 2021.
    112. SpaceX Boca Chica: Super Heavy BN2 Forward Dome Spotted - Damaged Raptor Loaded onto Raptor Van. NASASpaceflight. 19 January 2021. Archived from the original on 12 February 2021. Retrieved 22 August 2021 via YouTube.
    113. "Starship SN10 Static Fires twice – Super Heavy waiting in the wings". 25 February 2021.
    114. SpaceX Boca Chica - SN20 Leg Skirt Spotted - BN1 Booster Double Section Lifted Onto New Stand. NASASpaceflight. 8 March 2021. Archived from the original on 9 May 2021. Retrieved 22 August 2021 via YouTube.
    115. Starship 20 Lifted on to Pad B for Proof Testing (YouTube). 18 August 2021.
    116. "Booster 3 opens Super Heavy test campaign as orbital vehicles prepare to stack". NASAspaceflight.com. 3 July 2021. Even a Thrust Dome for Ship 21 was seen this weekend
    117. Ship 24 Spin Prime Testing | Starship Boca Chica, retrieved 11 August 2022
    118. Mike Wall (10 August 2022). "SpaceX fires up Starship and Super Heavy Booster 7 ahead of test flight". Space.com. Retrieved 10 August 2022.
    119. SpaceX Removes Ship 20 From the Launch Site | SpaceX Boca Chica, retrieved 11 August 2022
    120. Chopsticks tested ahead of potential use stacking Booster 7 | SpaceX Boca Chica, retrieved 11 August 2022
    121. Crush Test! SpaceX trying to find limit of B7.1. New Ship 28 Parts sighted at Starbase! | WAI NC, retrieved 17 August 2022
    122. Commercial Space Transportation Experimental Permit -- Experimental Permit Number: EP19-012, FAA, 21 June 2019, accessed 29 June 2019.
    123. Ralph, Eric (12 March 2019). "SpaceX begins static Starhopper tests as Raptor engine arrives on schedule". Teslarati. Retrieved 22 March 2019.
    124. Gebhardt, Chris (18 March 2019). "Starhopper first flight as early as this week; Starship/Superheavy updates". NASASpaceFlight.com. Retrieved 22 March 2019.
    125. Gebhardt, Chris (3 April 2019). "Starhopper conducts Raptor Static Fire test". NASASpaceFlight.com. Archived from the original on 4 April 2019. Retrieved 4 April 2019.
    126. Grush, Loren (3 April 2019). "SpaceX just fired up the engine on its test Starship vehicle for the first time". The Verge. Archived from the original on 4 April 2019. Retrieved 4 April 2019.
    127. Baylor, Michael (17 May 2019). "SpaceX considering SSTO Starship launches from Pad 39A". NASASpaceFlight. Retrieved 16 December 2019.
    128. Bergin, Chris [@NASASpaceflight] (5 April 2019). "StarHopper enjoys second Raptor Static Fire!" (Tweet). Retrieved 23 May 2019 via Twitter.
    129. Ralph, Eric (24 December 2018). "SpaceX CEO Elon Musk: Starship prototype to have 3 Raptors and "mirror finish"". Teslarati. Archived from the original on 24 December 2018. Retrieved 24 December 2018.
    130. Foust, Jeff (24 December 2018). "Musk teases new details about redesigned next-generation launch system". SpaceNews. Retrieved 25 December 2018.
    131. 'Totally Nuts'? Elon Musk Aims to Put a Starship in Orbit in 6 Months. Here's SpaceX's Plan. Mike Wall, Space.com. 30 September 2019.
    132. Berger, Eric (26 July 2019). "SpaceX's Starship prototype has taken flight for the first time". Ars Technica. Retrieved 8 August 2019.
    133. Foust, Jeff (27 August 2019). "SpaceX's Starhopper completes test flight". SpaceNews. Archived from the original on 26 November 2021. Retrieved 28 August 2019.
    134. Bergin, Chris (30 October 2019). "Starship Mk1 arrives at launch site ahead of flight test". NASASpaceFlight.com. Retrieved 31 May 2021.
    135. "SpaceX's Starship is a new kind of rocket, in every sense". The Economist. 5 October 2019. Retrieved 23 November 2019.
    136. Wall, Mike (30 September 2019). "'Totally Nuts'? Elon Musk Aims to Put a Starship in Orbit in 6 Months. Here's SpaceX's Plan". Space.com. Retrieved 23 November 2019.
    137. Sheetz, Michael (17 October 2019). "Aerial video shows SpaceX beginning construction of another Starship rocket in Florida". CNBC. Retrieved 18 October 2019.
    138. Grush, Loren (20 November 2019). "SpaceX's prototype Starship rocket partially bursts during testing in Texas". The Verge. Retrieved 10 March 2020.
    139. Wall, Mike (20 November 2019). "SpaceX's 1st Full-Size Starship Prototype Suffers Anomaly in Pressure Test". Space.com. Retrieved 21 November 2019.
    140. Marley, Ronnie (20 November 2019). "SpaceX moving to MK3 vehicle following incident at Boca Chica Facility". CBS News. Retrieved 10 March 2020.
    141. Musk, Elon [@elonmusk] (28 December 2019). "We're now building flight design of Starship SN1, but each SN will have at least minor improvements, at least through SN20 or so of Starship V1.0" (Tweet) via Twitter.
    142. Ralph, Eric (28 January 2020). "SpaceX is ready to build the first Starship destined for space after latest tests".
    143. Ralph, Eric (12 January 2020). "SpaceX just blew up a Starship tank on purpose and Elon Musk says the results are in".
    144. Musk, Elon [@elonmusk] (27 January 2020). "Starship 9m test tank made 7.5 bar at room temp! Small leak at a weld double. Will be repaired & retested at cryo. t.co/Bz3lrwkYRU" (Tweet). Archived from the original on 3 June 2021. Retrieved 22 August 2021 via Twitter.
    145. Musk, Elon [@elonmusk] (29 January 2020). "8.5 bar" (Tweet) via Twitter.
    146. January 2020, Hanneke Weitering 30 (30 January 2020). "SpaceX just destroyed a huge tank for its Starship on purpose. Here's the video!". Space.com.
    147. Musk, Elon [@elonmusk] (10 January 2020). "@Erdayastronaut @BocaChicaGal @NASASpaceflight Dome to barrel weld made it to 7.1 bar, which is pretty good as ~6 bar is needed for orbital flight. With more precise parts & better welding conditions, we should reach ~8.5 bar, which is the 1.4 factor of safety needed for crewed flight" (Tweet). Archived from the original on 20 May 2021. Retrieved 22 August 2021 via Twitter.
    148. Wall, Mike (10 March 2020). "SpaceX's latest Starship prototype passes big tank pressure test". Space.com. Retrieved 10 March 2020.
    149. Foust, Jeff (1 March 2020). "Second Starship prototype damaged in pressurization test". SpaceNews. Retrieved 10 March 2020.
    150. "Starship SN3 failure due to bad commanding. SN4 already under construction". 5 April 2020.
    151. Baylor, Michael (26 April 2020). "SN4 becomes first full-scale Starship prototype to pass cryogenic proof test". NASASpaceFlight. Retrieved 23 September 2020.
    152. Arevalo, Evelyn (9 May 2020). "SpaceX completes another round of Starship tests at Boca Chica". Tesmanian. Retrieved 23 September 2020.
    153. Ralph, Eric (22 May 2020). "SpaceX Starship prototype charred but intact after catching fire [photos]".
    154. Foust, Jeff (29 May 2020). "SpaceX Starship prototype destroyed after static-fire test". SpaceNews. Retrieved 30 May 2020.
    155. Bergin, Chris (27 July 2020). "Starship SN5 completes successful Static Fire test". NASASpaceFlight.com. Retrieved 4 August 2020.
    156. Etherington, Darrell (5 August 2020). "SpaceX Successfully Flies its Starship Prototype to a Height of Around 500 Feet". techcrunch.
    157. SpaceX Boca Chica: New 3mm Thick Test Tank Stacked - Starship SN6 Scrapped (YouTube). NASASpaceflight.com. 12 January 2021.
    158. @bocachicagal (4 February 2021). "The crew are currently cutting around the upper portion of Starship SN5" (Tweet). Retrieved 4 February 2021 via Twitter.
    159. Baylor, Michael (15 July 2020). "Starship SN5 set for a static fire followed shortly by a 150-meter hop attempt". NASASpaceFlight. Retrieved 17 July 2020. The most recent test tank, designated SN7, achieved a record pressure before it failed. SN7 was the pathfinder vehicle for the switch to 304L stainless steel. The next test tank – designated SN7.1 – will feature further build-quality improvements, as it attempts to break the record set by SN7.
    160. "As Starships line up, Musk calibrates expectations for SN8 test". 1 November 2020. Retrieved 3 November 2020.
    161. Baylor, Michael. "Starship SN8 History". nextspaceflight.com. Retrieved 29 January 2021.
    162. Musk, Elon [@elonmusk] (9 December 2020). "Fuel header tank pressure was low during landing burn, causing touchdown velocity to be high & RUD, but we got all the data we needed! Congrats SpaceX team hell yeah!!" (Tweet). Archived from the original on 28 June 2021. Retrieved 22 August 2021 via Twitter.
    163. Wall, Mike (10 December 2020). "SpaceX's Starship SN8 Prototype Soars on Epic Test Launch, with Explosive Landing". Scientific American. Retrieved 3 March 2021.
    164. Ralph, Eric (14 December 2020). "SpaceX almost drops finished Starship prototype - but it might be salvageable". TESLARATI. Retrieved 13 February 2021.
    165. SpaceX Boca Chica - Starship SN9 Gets a New Forward Flap - Tankzilla Prepared for move (YouTube). NASASpaceflight. 20 December 2020.
    166. Wall 13, Mike (January 2021). "SpaceX's Starship SN9 prototype fires up rocket engines three times in one day". Space.com. Retrieved 14 January 2021.
    167. January 2021, Mike Wall 15 (15 January 2021). "SpaceX swapping out two engines on Starship SN9 prototype ahead of test flight". Space.com. Retrieved 17 January 2021.
    168. Foust, Jeff (29 January 2021). "FAA reviews delay SpaceX Starship test". SpaceNews. Retrieved 30 January 2021.
    169. Chris Bergin - NSF [@NASASpaceflight] (2 February 2021). "Nice try, SN9! But didn't hit SN10 or the Tank Farm. You're next, SN10! ➡️t.co/2eJwgJUTLl t.co/Eh3Dn6C9M4" (Tweet). Archived from the original on 10 February 2021. Retrieved 22 August 2021 via Twitter.
    170. SpaceX Boca Chica - Starship Landing Pad Work ahead of SN10 Launch - SN11/SN16 Prepare. NASASpaceflight. 11 February 2021. Archived from the original on 20 May 2021. Retrieved 22 August 2021 via YouTube.
    171. @elonmusk (4 February 2021). "It was foolish of us not to start 3 engines & immediately shut down 1, as 2 are needed to land. Will these changes be able to be implemented into the SN10 test flight? Yes" (Tweet) via Twitter.
    172. Wall, Mike (25 February 2021). "SpaceX fires up SN10 Starship prototype for 2nd time". space.com.
    173. @elonmusk (3 March 2021). "Launch abort on slightly conservative high thrust limit. Increasing thrust limit & recycling propellant for another flight attempt today" (Tweet) via Twitter.
    174. "SpaceX's Starship rocket lands but then explodes". BBC News. 4 March 2021.
    175. "Elon Musk reveals why the SN10 Starship exploded". Engadget.
    176. Chris Bergin - NSF [@NASASpaceflight] (11 March 2021). "Road open and workers heading back to the pad, led by the SpaceX Security Tesla with its disco lights flashing. That concludes Cryo proof testing for Starship SN11. ➡️t.co/ofhFayHX2d t.co/GsnnNkCPiT" (Tweet). Archived from the original on 12 March 2021. Retrieved 22 August 2021 via Twitter.
    177. @NASASpaceflight (12 March 2021). "Starship SN11 RCS (Reaction Control System) testing.➡️" (Tweet). Retrieved 12 March 2021 via Twitter.
    178. @NASASpaceflight (15 March 2021). "Starship SN11. Aborted Static Fire. ➡️" (Tweet). Retrieved 15 March 2021 via Twitter.
    179. Chris Bergin - NSF [@NASASpaceflight] (22 March 2021). "STATIC FIRE! Starship SN11 has fired up her three engines ahead of a test flight (as early as Tuesday), pending good test data (looked/sounded good!) Status: t.co/4WkVsCJMiE Live: t.co/cQerCZ0hor t.co/AAcI21mQl9" (Tweet). Archived from the original on 10 April 2021. Retrieved 22 August 2021 via Twitter.
    180. Baylor, Michael [@nextspaceflight] (24 March 2021). "SpaceX will conduct a second static fire test after one of three Raptor engines on Starship SN11 had to be removed for repairs. The static fire could occur as soon as Friday, pending Raptor readiness and road closures. t.co/Rl0cyUwxQy" (Tweet). Archived from the original on 31 March 2021. Retrieved 22 August 2021 via Twitter.
    181. Mahlmann, Trevor [@TrevorMahlmann] (25 March 2021). "It's up and it's good! 😆 SpaceX Raptor 46 has risen up into the engine bay to be installed 🚀 ⚙️/⬇️/🖼: t.co/9F6dPuv097 t.co/P8MwvmHQUl" (Tweet). Archived from the original on 31 March 2021. Retrieved 22 August 2021 via Twitter.
    182. Chris Bergin - NSF [@NASASpaceflight] (26 March 2021). "STATIC FIRE! Starship SN11 fires up (at least) Raptor SN46. Providing the data review is good, a launch will be attempted later today. t.co/O9OxyFXT2f t.co/8P2DSjS0Au" (Tweet). Archived from the original on 29 March 2021. Retrieved 22 August 2021 via Twitter.
    183. Musk, Elon [@elonmusk] (30 March 2021). "@SpaceX Looks like engine 2 had issues on ascent & didn't reach operating chamber pressure during landing burn, but, in theory, it wasn't needed. Something significant happened shortly after landing burn start. Should know what it was once we can examine the bits later today" (Tweet). Archived from the original on 31 May 2021. Retrieved 22 August 2021 via Twitter.
    184. Chris Bergin - NSF [@NASASpaceflight] (30 March 2021). "Ended in a RUD. Remember, it's a test program and they've gained a lot of wins from the four flights. Stable controlled descent is one, but long-duration Raptor performance deserves a shoutout. This was the last view from SpaceX and sign off from John Insprucker: t.co/4KAnLEWIUG" (Tweet). Archived from the original on 24 April 2021. Retrieved 22 August 2021 via Twitter.
    185. @bocachicagal (23 January 2021). "Meanwhile, at SpaceX Boca Chica Starship SN10 took a peek out of the high bay as Starship SN12's aft section was being scrapped" (Tweet) via Twitter.
    186. @elonmusk (25 November 2020). "Major upgrades are slated for SN15" (Tweet) via Twitter.
    187. "Starship SN15 Flight Test". SpaceX. 5 May 2021. Archived from the original on 5 May 2021. Retrieved 6 May 2021.
    188. "SpaceX installs Starlink dish on upgraded Starship prototype". 14 April 2021.
    189. @op_boca (9 April 2021). "Today, SpaceX teams conducted an ambient pressure test of Starship SN15" (Tweet) via Twitter.
    190. "SpaceX's upgraded Starship gets frosty during cryogenic proof test". 12 April 2021.
    191. "When will SN15 launch? Live Updates". 8 April 2021. Retrieved 14 April 2021.
    192. @TheFavoritist (28 April 2021). "Starship SN15 static fires its Raptors again, though this time we believe only a single was engine fired" (Tweet) via Twitter.
    193. Timmer, John (5 May 2021). "SpaceX successfully lands a Starship test flight". arstechnica.com.
    194. "SN15". The Starship Campaign. Retrieved 19 November 2021.
    195. @NASASpaceflight (7 April 2021). "As Starship SN15 prepares to roll to the launch site, the Forward Dome of SN20 has been spotted, with this vehicle set to be an Orbital Class Starship" (Tweet) via Twitter.
    196. @_brendan_lewis (9 April 2021). "The current status of SpaceX's Starship & Superheavy prototypes" (Tweet) via Twitter.
    197. Clark, Stephen. "SpaceX outlines plans for Starship orbital test flight – Spaceflight Now". Retrieved 14 May 2021.
    198. Wall, Mike (10 August 2022). "SpaceX fires up Starship and Super Heavy Booster 7 ahead of test flight". Retrieved 11 August 2022.
    199. Twitter https://twitter.com/elonmusk/status/1506077232342581251. Retrieved 11 August 2022. {{cite web}}: Missing or empty |title= (help)
    200. Bergin, Chris (9 August 2022). "Twitter post". Twitter. Retrieved 11 August 2022.
    201. "SpaceX's Starship SN24 Roars to Life During Six Engine Static-Fire Test". Tesmanian. Retrieved 9 September 2022.
    202. Starship 24 Thermal Protection Tiles Repaired | SpaceX Boca Chica, retrieved 12 October 2022
    203. Ali, Iqtidar (12 October 2022). "SpaceX stacks Starship 24 on Super Heavy Booster 7 probably for the last time before the 1st orbital flight test". Tesla Oracle. Retrieved 15 October 2022.
    204. Ralph, Eric (9 November 2020). "SpaceX begins assembling first Starship Super Heavy booster in South Texas". Teslarati. Retrieved 15 November 2020.
    205. SpaceX Boca Chica - First Super Heavy Booster Parts - SN8 Flaps Installed (YouTube). NASASpaceFlight. 23 September 2020.
    206. Musk, Elon [@elonmusk] (30 March 2021). "BN1 is a manufacturing pathfinder, so will be scrapped. We learned a lot, but have already changed design to BN2. Goal is to get BN2 with engines on orbital pad before end of April. It might even be orbit-capable if we are lucky" (Tweet) via Twitter.
    207. @BocaChicaGal (13 April 2021). "The dismantling of BN1 has begun" (Tweet) via Twitter.
    208. "Starship SN15 to undergo flight test Tuesday". 4 May 2021. BN1 has since been cut into sections and sent to the scrapyard
    209. Bergin, Chris [@NASASpaceflight] (28 March 2021). "As Starship SN11 awaits launch, the Forward Dome Section for Super Heavy Prototype BN3 has been spotted at the Production Site" (Tweet) via Twitter.
    210. Super Heavy BN3 section spotted | SpaceX Boca Chica. NASASpaceflight. 28 March 2021. Archived from the original on 29 April 2021. Retrieved 22 August 2021 via YouTube.
    211. "SpaceX test fires massive Super Heavy booster for Starship for 1st time". Space.com. 19 July 2021.
    212. Booster 3 Scrapped (YouTube). 15 August 2021.
    213. Super Heavy Booster 3 Prepared for Testing on Pad A | SpaceX Boca Chica. NASASpaceflight. 2 July 2021. Archived from the original on 11 July 2021. Retrieved 22 August 2021 via YouTube.
    214. "Super Heavy Booster 3 fires up for the first time". Nasaspaceflight.com. 19 July 2021. the impressive Thrust Puck for Booster 5 has already arrived at SpaceX Starbase
    215. Team at Starbase completed a single Raptor engine static fire test of Super Heavy Booster 7 on the orbital launch pad, 9 August 2021, retrieved 11 August 2022
    216. 33 engine boosters anyone? A 13 engine thrust puck spotted for a future booster which will have the full 33 engine complement., 6 October 2021, retrieved 11 August 2022
    217. First Upgraded Sections of Booster 9 Spotted | SpaceX Boca Chica, 15 June 2022, retrieved 11 August 2022
    218. SpaceX Tests Water Deluge for Upcoming Static Fire | SpaceX Boca Chica, 8 August 2022, retrieved 17 August 2022
    219. @elonmusk (4 July 2021). "Booster engines are not shrouded by skirt extension, as with ship. Engines extend about 3m below booster" (Tweet) via Twitter.
    220. Musk, Elon [@elonmusk] (18 March 2021). "Yes, Booster 1 is a production pathfinder, figuring out how to build & transport 70 meter tall stage. Booster 2 will fly" (Tweet) via Twitter.
    221. Bergin, Chris (28 December 2020). "Starship SN9's time to shine – test series targets a New Year's resolution". NASASpaceFlight.com. Retrieved 29 December 2020.
    222. Mary [@BocaChicaGal] (18 March 2021). "Wow.....Booster BN1 is fully stacked in the high bay" (Tweet) via Twitter.
    223. "Elon Musk says SpaceX's second Starship booster prototype is almost finished". Teslarati. 25 June 2021.
    224. @elonmusk (30 June 2021). "First one to fly will [have grid fins], so Booster 4. Booster 3 will be used for ground tests. We're changing much of design from 3 to 4. Booster 3 was very hard to build. Expect especially rapid evolution in first ~10 boosters & first ~30 ships" (Tweet) via Twitter.
    225. @elonmusk (25 June 2021). "We're almost done with first prototype booster. This will go to test stand A. Next one will fly to orbit. Team has been crushing it many days & nights in a row!" (Tweet) via Twitter.
    226. Super Heavy Booster 3 Stacked | SpaceX Boca Chica. NASASpaceflight. 29 June 2021. Archived from the original on 11 July 2021. Retrieved 22 August 2021 via YouTube.
    227. "SpaceX Transports A Super Heavy Booster Prototype To The Launch Pad". Tesmanian.com. Retrieved 1 July 2021.
    228. Bergin, Chris (2 August 2021). "Starbase Surge sees SpaceX speed ahead with Booster 4 and Ship 20". NASASpaceFlight.com. Retrieved 2 August 2021.
    229. Super Heavy Booster 3's LOX Tank Finally Scrapped | SpaceX Boca Chica, retrieved 11 August 2022
    230. "Starbase Surge sees SpaceX speed ahead with Booster 4 and Ship 20". NASASpaceflight.com. 3 August 2021.
    231. @elonmusk (11 July 2021). "Final decision made earlier this week on booster engine count. Will be 33 at ~230 (half million lbs) sea-level thrust" (Tweet) via Twitter.
    232. Cao, Sissi (6 August 2021). "Starship Completes Stacking Giant Starship Stages For Orbital Flight". Observer. Retrieved 19 November 2021.
    233. "Super Heavy Booster 4 Lifted to Orbital Launch Mount". YouTube. 8 September 2021. Retrieved 19 November 2021.
    234. @NASASpaceflight (17 December 2021). "And there's some impressive depress venting on Booster 4! A possible conclusion to a good cryogenic pressure test!…" (Tweet) via Twitter.
    235. SpaceX Booster 7 Experiences Explosion, 11 July 2022, retrieved 18 July 2022
    236. Booster 7 Rolled Back for Repairs | SpaceX Boca Chica, 16 July 2022, retrieved 11 August 2022
    237. Chopsticks Break Down Before Lifting Booster 7 | SpaceX Boca Chica, 8 August 2022, retrieved 11 August 2022
    238. Twitter https://twitter.com/spacex/status/1557839580979535872. Retrieved 11 August 2022. {{cite web}}: Missing or empty |title= (help)
    239. Twitter https://twitter.com/elonmusk/status/1558303186326265857. Retrieved 13 August 2022. {{cite web}}: Missing or empty |title= (help)
    240. Booster 7 Back At The Pad With 33 Engines For Testing, retrieved 24 August 2022
    241. Twitter https://twitter.com/thejackbeyer/status/1563089115066691584. Retrieved 28 August 2022. {{cite web}}: Missing or empty |title= (help)
    242. Starship Testing Causes Grass Fire | SpaceX Boca Chica, retrieved 21 September 2022
    243. Starship 25 Nosecone Stacked and Booster 7 Spin Prime Testing | SpaceX Boca Chica, retrieved 21 September 2022
    244. Booster 8 Rolled Out to the Launch Site for Testing | SpaceX Boca Chica, retrieved 21 September 2022
    245. Booster 7 Lifted Off the Orbital Launch Mount (and rolled back) | SpaceX Boca Chica, retrieved 12 October 2022
    246. Booster 7 Rolled Out for Launch (we hope) | SpaceX Boca Chica, retrieved 12 October 2022
    247. Super Heavy Booster 8 Parts Delivered | SpaceX Boca Chica, 4 February 2022, retrieved 11 August 2022
    248. Booster 8 is fully stacked!, 8 July 2022, retrieved 11 August 2022
    249. Booster 8 Rolled Out to the Launch Site for Testing | SpaceX Boca Chica, retrieved 12 October 2022
    250. SpaceX Boca Chica - Starship Test Tank mated - Jan 7, 2020 (YouTube). NASASpaceFlight. 7 January 2020.
    251. Aravelo, Evelyn (10 January 2020). "SpaceX conducted a pressure test on a Starship dome tank at Boca Chica today". Tesmaian. Retrieved 1 February 2021.
    252. SpaceX Boca Chica - Starship Nosecone Heads to Launch Site - Bulkhead Flip. NASASpaceflight. 23 January 2020. Archived from the original on 30 September 2020. Retrieved 22 August 2021 via YouTube.
    253. SpaceX Boca Chica - Header Tank tested to failure. Test Tank preps for transport. NASASpaceflight. 26 January 2020. Retrieved 22 August 2021 via YouTube.
    254. SpaceX Boca Chica - Starship Bulkhead/Dome Test Tank 2 Mated (YouTube). NASASpaceFlight. 25 January 2020.
    255. SpaceX Boca Chica - Starship Test Tank 2 Destructive Cryo Test. NASASpaceflight. 29 January 2020. Archived from the original on 18 February 2021. Retrieved 22 August 2021 via YouTube.
    256. @elonmusk (9 February 2020). "First two domes in frame are for SN2, third is SN1 thrust dome" (Tweet) via Twitter.
    257. SpaceX Boca Chica - Starship SN2 Test Tank transported from Launch Site. NASASpaceflight. 16 March 2020. Archived from the original on 8 December 2020. Retrieved 22 August 2021 via YouTube.
    258. SpaceX Boca Chica - All of the Starships out in the ope (YouTube). NASASpaceFlight. 25 May 2020. SN7's first rings have been spotted
    259. Mali, Tariq (23 June 2020). "Boom! SpaceX pops huge Starship SN7 test tank on purpose in pressure test". Space.com. Retrieved 30 January 2021. SpaceX pushed a massive tank for its latest Starship prototype beyond its limits Tuesday (June 23) in an intentionally explosive test in South Texas. The Starship SN7 prototype tank ruptured during a pressure test at SpaceX's Boca Chica proving grounds, the second in just over a week for the spacecraft component.
    260. Wall, Mike (24 September 2020). "SpaceX pops Starship tank on purpose in explosive pressure test". Space.com. Retrieved 13 February 2021.
    261. SpaceX Boca Chica - Starship SN11 ready to complete Stacking Operations (YouTube). NASASpaceFlight. 27 December 2020.
    262. "Laying the groundwork for Super Heavy amid Raptor Ramp Up". NasaSpaceflight.com. 30 May 2021. BN2 and BN2.1 sections were classed as test sections and were never set to become more than test tanks
    263. @BocaChicaGal (3 June 2021). "This afternoon the BN2.1 test tank is ready to roll to the pad at SpaceX Starbase" (Tweet) via Twitter.
    264. GSE-4 Tank Fails During Testing | SpaceX Boca Chica, retrieved 20 January 2022
    265. SpaceX Boca Chica - Starship Header Tank Pressurization Test. NASASpaceflight. 25 January 2020. Archived from the original on 24 May 2021. Retrieved 22 August 2021 via YouTube.
    266. Chris Bergin - NSF [@NASASpaceflight] (28 January 2020). "Farewell Test Tank 2, and we thank you. t.co/Je69rLmr28 t.co/AUpIb7kv24" (Tweet). Archived from the original on 23 January 2021. Retrieved 22 August 2021 via Twitter.
    267. Baylor, Michael. "Starship SN7 History". nextspaceflight.com. Retrieved 9 February 2021.
    268. Starship's SN7.1 Pushed To Failure (Time Lapse). LabPadre. 23 September 2020. Archived from the original on 23 February 2021. Retrieved 22 August 2021 via YouTube.
    269. @elonmusk (26 September 2020). "8 bar differential in ullage, 9 bar at base due to propellant head. It's enough. Improvements in work" (Tweet) via Twitter.
    270. Ralph, Eric (27 January 2021). "SpaceX's thin-skinned Starship 'test tank' passes first trial". Teslarati. Retrieved 30 January 2021. Known as Starship SN7.2, SpaceX’s latest ‘test tank’ is the third to carry the SN7 moniker and appears to have been built primarily to test refinements to the rocket’s structural design...the tank’s most important task is determining if future Starships (and perhaps Super Heavy boosters) can be built out of thinner, lighter steel rings. Its domes appear to be identical to past ships but writing on the exterior of the tank strongly implied that its three rings were built out of 3mm steel rather than the 4mm sheets that have made up every Starship built in the last 12 months.
    271. Baylor, Michael. "Starship SN7.2 History". nextspaceflight.com. Retrieved 6 February 2021.
    272. Mary [@BocaChicaGal] (15 March 2021). "Starship SN7.2 is headed back to the production site at SpaceX Boca Chica. 🔥🚀🔥 @NASASpaceflight t.co/9RrqG6sHZ6" (Tweet). Archived from the original on 11 April 2021. Retrieved 22 August 2021 via Twitter.
    273. SpaceX Boca Chica: Starship SN11 Abort Static Fire - SN7.2 Moved to the Production Site. NASASpaceflight. 15 March 2021. Archived from the original on 8 May 2021. Retrieved 22 August 2021 via YouTube.
    274. Super Heavy Test Tank Cryogenic Proof Test. NASASpaceflight. 8 June 2021. Archived from the original on 28 June 2021. Retrieved 22 August 2021 via YouTube.
    275. Super Heavy Test Tank Cryogenic Proof Test #2. NASASpaceflight. 17 June 2021. Archived from the original on 27 June 2021. Retrieved 22 August 2021 via YouTube.
    276. @NASASpaceflight (1 December 2021). "Test Tank B2.1 has decided it's time to get frosty" (Tweet) via Twitter.
    277. Bergin, Chris. "Test Tank B2.1 is undergoing more testing today, supplied by the Orbital Launch Site's Tank Farm on what is a very foggy morning". Twitter. @NASASpaceflight. Retrieved 3 December 2021.
    278. Starlink Loader Moved Into Potential Clean Room | SpaceX Boca Chica, retrieved 22 July 2022
    279. B7.1 Test Tank Tested | SpaceX Starbase, retrieved 22 July 2022
    280. Ship 24 Raptor Engines Tested with Two Spin Primes | SpaceX Boca Chica, retrieved 25 July 2022
    281. GSE Test Tank Undergoes Cryogenic Proof Testing | SpaceX Boca Chica, retrieved 19 January 2022
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