Tiangong program

The Tiangong program (Chinese: 天宫空间站工程; pinyin: Tiāngōng kōngjiānzhàn gōngchéng)[1][2] is China's space program to create a modular space station, comparable to Mir. This program is independent and unconnected to any other international space-active countries.[3] The program is part of the China Manned Space Program that began in 1992. The core module, the Tianhe ("Harmony of the Heavens") was finally launched on 29 April 2021 marking the start of the Tiangong Space program deployment.

For other uses, see Tiangong (disambiguation).

Diagram of Tiangong-1

China launched its first space laboratory, Tiangong-1, on 29 September 2011. Following Tiangong-1, a more advanced space laboratory complete with cargo spacecraft, dubbed Tiangong-2, was launched on 15 September 2016. The first module of the 12 part new series of Tiangong space station launched on 29 April 2021.

The project will culminate with the Tiangong space station, which consist of a 22.6-ton core module and cargo transport craft, with two more major research modules to be launched in 2022.[4] It supports three astronauts for long-term habitation.[5]

Background
Main article: Chinese space program
Yang Liwei, first Chinese astronaut, the third country to launch a crewed spaceflight.
Chinese space food

After the United States threatened to use nuclear weapons during the Korean War,[6][7] Mao Zedong decided that only a nuclear deterrent of its own would guarantee the security of the newly founded PRC. Thus, Mao announced his decision to develop China's own strategic weapons, including associated missiles. After the launch of mankind's first artificial satellite, Sputnik 1 by the Soviet Union on 4 October 1957, Mao decided to put China on an equal footing with the superpowers ("我们也要搞人造卫星"), using Project 581 with the idea of putting a satellite in orbit by 1959 to celebrate the 10th anniversary of the PRC's founding. However, it would not be until 24 April 1970 that this goal would become a reality.

Mao and Zhou Enlai began the PRC's crewed space program on 14 July 1967.[8] China's first crewed spacecraft design was named Shuguang-1 (曙光一号) in January 1968.[9] Project 714 was officially adopted in April 1971 with the goal of sending two astronauts into space by 1973 aboard the Shuguang spacecraft. The first screening process for astronauts had already ended on 15 March 1971, with 19 astronauts chosen. The program was soon cancelled due to political turmoil.

The next crewed space program was even more ambitious and was proposed in March 1986 as Project 863. This consisted of a crewed spacecraft (Project 863–204) used to ferry astronaut crews to a space station (Project 863–205). Several spaceplane designs were rejected two years later and a simpler space capsule was chosen instead. Although the project did not achieve its goals, it would ultimately become the 1992 Project 921, encompassing the Shenzhou program, the Tiangong program, and the Chinese space station.

On the 50th anniversary of the People's Republic of China's founding, China launched the Shenzhou 1 spacecraft on 20 November 1999 and recovered it after a flight of 21 hours. The country became the third country with a successful crewed space program by sending Yang Liwei into space aboard Shenzhou 5 on 15 October 2003 for more than 21 hours. It was a major success for Chinese space programs.

Project history
See also: List of human spaceflights in Tiangong Program

In 1999, Project 921-2 was finally given official authorization. Two versions of the station were studied: an 8-metric ton "space laboratory" and 20-metric ton "space station". In 2000, the first model of the planned space station was unveiled at Expo 2000 in Hanover, Germany. This was made up of modules derived from the orbital module of the Shenzhou spacecraft. Overall length of the station would be around 20 m, with a total mass of under 40 metric tons, with possibility of expansion through addition of further modules.

In 2001, Chinese engineers described a three-step process toward the realization of Project 921. The original target date for the fulfillment of the project was 2010.

  • First, crewed flight itself (Phase 1); this successfully occurred in 2003
  • Second, the orbiting of a space laboratory (Phase 2, a scaled back version of the initial model) that would only be crewed on a short-term basis and left in an automated mode between visits
  • The third phase would involve the launch of a larger space laboratory, which would be permanently crewed and be China's first true space station (Phase 3)

Originally, China planned to simply dock Shenzhou 8 and Shenzhou 9 together to form a simple space laboratory. However, it was decided to abandon that plan and launch a small space laboratory instead. In 2007, plans for an 8-metric ton "space laboratory" being launched in 2010 under the designation of Tiangong-1 were made public. This would be an eight-ton space laboratory module with two docking ports. Subsequent flights (Shenzhou 9 and Shenzhou 10) will dock with the laboratory.[10]

On 29 September 2008, Zhang Jianqi (张建启), Vice Director of China crewed space engineering, declared in an interview of China Central Television (CCTV), it is Tiangong-1 that will be the 8-ton "target vehicle", and Shenzhou 8, Shenzhou 9, and Shenzhou 10 will all be spaceships to dock with Tiangong-1 in turn.[11] On 1 October 2008, Shanghai Space Administration, which participated in the development of Shenzhou 8, stated that they succeeded in the simulated experiments for the docking of Tiangong-1 and Shenzhou 8.[12]

In September 2010, the central government formally approved the implementation of China's manned space station project, and plans to build a large-scale, long-term manned national space laboratory around 2020.[13]

On 16 June 2012, Shenzhou 9 was launched from Jiuquan Satellite Launch Center in Inner Mongolia, China, carrying a crew of three. The Shenzhou craft successfully docked with the Tiangong-1 laboratory on 18 June 2012, at 06:07 UTC, marking China's first crewed spacecraft docking.[14]

On 11 June 2013, China launched Shenzhou 10 with a crew of three headed for the Tiangong-1.[15]

Tiangong-2 space laboratory launched on 15 September 2016.[16][17][18] This was first crewed with Shenzhou 11 which launched on 17 October 2016 (16 October UTC) from the Jiuquan Satellite Launch Center and docked two days later.[16]

The full 60-metric ton space station will support three astronauts for long-term habitation. The core module, the Tianhe ("Harmony of the Heavens"), launched on 29 April 2021.[19] The Tianhe module was first crewed with the Shenzhou 12 mission which launched and docked on 17 June 2021.[20]

Details

Space laboratory phase

Chinese efforts to develop low Earth orbit space station capabilities will begin with a space laboratory phase, with the launch of three Tiangong test vehicles (later reduced to two).[5]

Tiangong-1 "target vehicle"
Main article: Tiangong-1
Drawing of Shenzhou docked to Tiangong-1

The Chinese docking target consists of a propulsion (resource) module and a pressurized module for experiments, with a docking mechanism at either end. The docking port of the experiment section supports automated docking.[21] Its length is 10.5 m (34 ft), diameter is 3.4 m (11 ft),[5] with a mass of 8,000 kg (18,000 lb). Launched on 29 September 2011, it was intended for short stays of a crew of three.[21][10][11] The second docking port, on the propulsion module, was kept screened from press photography inside and outside the module. It re-entered and burned up in the atmosphere on 2 April 2018, at 00:16 UTC.[22]

Tiangong-2 "space laboratory"
Main article: Tiangong-2
Model of a Shenzhou docked to a Tiangong

A second and a third test station were originally planned to precede the eventual modular station. These would be 14.4 m (47 ft) long, with a diameter of 4.2 m (14 ft), and weigh up to 20,000 kg (44,000 lb).[3] The second one would provide life support for a crew of 2 for 20 days, and the third one a crew of 3 for 40 days.[5] However, all the objectives of these two stations were later merged into one project,[23] and the size scaled down to less than 10,000 kg (22,000 lb).

The resulting Tiangong-2 space laboratory was launched on 15 September 2016.[24] The station made a controlled reentry on 19 July 2019 and burned up over the South Pacific Ocean.[25]

Tiangong-3
Main article: Tiangong-3

A third space station proposed but later cancelled in favor of advancing to the new large modular station.[26]

Tiangong space station
Main article: Tiangong space station

China plans to build the world's third multi-module space station, to follow Mir and the International Space Station (ISS).[4][3] This was dependent upon the date of OPSEK's separation from the ISS but after a statement in September 2017, the head of Roscosmos Igor Komarov said that the technical feasibility of separating the station to form OPSEK had been studied and there were now "no plans to separate the Russian segment from the ISS".[27]

The previous separate components will be integrated into a space station, arranged as:[5]

  • Tianhe Core Cabin Module (CCM) – based on the Tiangong-3 "space station" and analogous to the Mir Core Module. The 18.1-meter-long core module, with a maximum diameter of 4.2 meters and a launch weight of 22 tons,[28] was launched first on 29 April 2021.[29]
  • Laboratory Cabin Module I (LCM-1 Wentian) and Laboratory Cabin Module II (LCM-2 Mengtian) – based on Tiangong-2 "space laboratory". Each laboratory module is 14.4 meters long, with the same maximum diameter and launch weight of the core module.[28]
  • Shenzhou – crewed vessel
  • Tianzhou ("Heavenly Vessel") – a cargo craft based on Tiangong-1 that will have a maximum diameter of 3.35 m (11.0 ft) and a launch weight less than 13 t (13 long tons; 14 short tons), intended to transport supplies and experiments to the space station. The craft will have three versions: pressurized, unpressurized, and a combination of the two. It was first launched on the new Long March 7 launch vehicle from Wenchang on 20 April 2017.[30][31][32]

The larger station will be assembled in 2021–2022 and have a design lifetime of at least ten years. The complex will weigh approximately 60,000 kg (130,000 lb) and will support three astronauts for long-term habitation.[5] The public is being asked to submit suggestions for names and symbols to adorn the space station and cargo spacecraft. "Considering past achievements and the bright future, we feel that the crewed space program should have a more vivid symbol and that the future space station should carry a resounding and encouraging name", Wang Wenbao, director of the office, said at the news conference. "We now feel that the public should be involved in the names and symbols as this major project will enhance national prestige, and strengthen the national sense of cohesion and pride", Wang said.[28]

The core module, the Tianhe ("Harmony of the Heavens"), launched on 29 April 2021.[19]

Tiangong has an orbital altitude similar to that of the ISS and has approximately one-fifth the mass.[33]

International co-operation

After the success of China's crewed space launch, a Chinese official expressed interest in joining the International Space Station program.[34] In 2010, European Space Agency ESA Director-General Jean-Jacques Dordain stated that his agency was ready to propose to the four other partners (CSA, JAXA, NASA, and Roscosmos) that China, India, and South Korea be invited to join the ISS partnership.[35] China has indicated a willingness to cooperate further with other countries on crewed exploration.[36]

See also

References
  1. "China launches first section of its massive space station". China Daily. 29 April 2021. Archived from the original on 29 April 2021. China's most adventurous space endeavor, the multimodule space station, named Tiangong, or Heavenly Palace, will be mainly composed of three components
  2. "China launches space station core module Tianhe". Xinhua. 29 April 2021. The Tianhe module will act as the management and control hub of the space station Tiangong, meaning Heavenly Palace
  3. Branigan, Tania; Sample, Ian (26 April 2011). "China unveils rival to International Space Station". The Guardian. Retrieved 27 April 2011. China often chooses poetic names for its space projects, such as Chang'e – after the moon goddess – for its lunar probes; its rocket series, however, is named Long March, in tribute to communist history. The space station project is currently referred to as Tiangong, or "heavenly palace".
  4. Barbosa, Rui (1 March 2021). "China preparing to build Tiangong station in 2021, complete by 2022". NASASpaceFlight.com. Retrieved 2 March 2021.
  5. David, Leonard (7 March 2011). "China Details Ambitious Space Station Goals". SPACE.com. Retrieved 9 March 2011. China is ready to carry out a multiphase construction program that leads to a large space station around 2020. As a prelude to building that facility, China is set to loft the Tiangong-1 module this year as a platform to help master key rendezvous and docking technologies.
  6. Yue, Dongxiao (1998). "Korean War FAQ". Century China. Retrieved 12 March 2016.
  7. Cooper, Roxanne (9 October 2010). "US repeatedly threatened to use nukes on N. Korea: declassified documents". The Raw Story. Retrieved 12 March 2016.
  8. "首批航天员19人胜出 为后来积累了宝贵的经验". tech.tom.com (in Chinese). TOM Online. 16 September 2005. Archived from the original on 22 December 2005. Retrieved 24 July 2008.
  9. Chang, Ying, ed. (5 October 2005). "[焦点访谈]第一艘无人试验飞船发射成功―回首航天路（四". cctv.com (in Chinese). China Central Television. Retrieved 2 August 2007.
  10. Clark, Stephen (29 September 2011). "Chinese rocket successfully launches mini-space lab". Spaceflight Now. Retrieved 19 October 2011.
  11. "我国将于2010年-2011年发射小型空间站" [China will launch a small space station in 2010–2011] (in Chinese). Sina News. 29 September 2008. Retrieved 30 December 2020.
  12. "神八空间模拟对接初步成功" [Simulated docking of Shenzhou 8 has succeeded] (in Chinese). Sina News. 1 October 2008. Retrieved 30 December 2020.
  13. "集大众智慧于探索融中华文化于飞天". 5 November 2013. 最终决定沿用"天宫"作为载人空间站的整体名称，但后面不再加序号 (The final decision was to use "Tiangong" as the overall name of the manned space station, but without the serial number at the end)
  14. Amos, Jonathan (18 June 2012). "Shenzhou-9 docks with Tiangong-1". BBC News. Retrieved 21 June 2012.
  15. Harwood, William (11 June 2013). "China launches fifth manned space mission". CBC News. Retrieved 30 December 2020.
  16. "China's Shenzhou 11 blasts off on space station mission". BBC News. 16 October 2016. Retrieved 17 October 2016.
  17. de Selding, Peter B. (20 June 2016). "China prepares assembly of its space station, invites collaboration through U.N." Space News. Paris. Retrieved 22 September 2016.
  18. "Chinese Astronauts Dock with Tiangong-2 Space Lab". 19 October 2016. Retrieved 19 October 2016.
  19. Jones, Andrew (2 October 2019). "This Is China's New Spacecraft to Take Astronauts to the Moon (Photos)". SPACE.com. Retrieved 1 November 2019.
  20. Clark, Stephen (17 June 2021). "Chinese astronauts enter Tiangong space station for first time". Spaceflight Now. Retrieved 18 June 2021.
  21. "Tiangong I". cmse.gov.cn. China Manned Space Engineering Office. Archived from the original on 8 May 2011. Retrieved 26 October 2011.
  22. Thompson, Avery (19 September 2016). "China Confirms Its Space Station Is Falling Back to Earth". Popular Mechanics. Retrieved 30 December 2020.
  23. "脚踏实地，仰望星空——访中国载人航天工程总设计师周建平". cmse.gov.cn (in Chinese). China Manned Space Engineering Office. 28 April 2016. Retrieved 22 April 2017.
  24. "China to launch Tiangong-2 and cargo spacecraft in 2015". GB Times. 13 June 2013. Archived from the original on 18 June 2013. Retrieved 16 June 2013.
  25. Liptak, Andrew (20 July 2019). "China has deorbited its experimental space station". The Verge. Retrieved 21 July 2019.
  26. ""天宫二号"总设计师：不再有天宫三号 五年后建成空间站". 22 November 2017. "天宫二号"后，不再开发"天宫三号"，中国将直接进入空间站时代，空间站预计2022年建成 (After "Tiangong-2", no longer develop "Tiangong-3", China will directly enter the era of space station, the space station is expected to be completed in 2022)
  27. Foust, Jeff (25 September 2017). "International partners in no rush regarding future of ISS". SpaceNews. Retrieved 28 December 2018.
  28. Xin, Dingding (26 April 2011). "Countdown begins for space station program". China Daily. Retrieved 28 April 2011.
  29. "China launches first Tiangong space station module". Deutsche Welle. Retrieved 1 May 2021.
  30. Barbosa, Rui C. (19 April 2017). "Tianzhou-1 – China launches and docks debut cargo resupply". NASASpaceFlight.com. Retrieved 5 May 2018.
  31. Clark, Stephen (3 March 2016). "China to launch new space lab later this year". Spaceflight Now. Retrieved 8 March 2016.
  32. Jones, Morris (3 March 2014). "The Next Tiangong". Space Daily. Retrieved 30 December 2020.
  33. Koziol, Michael (2022). "A Permanent Space Station for China". IEEE Spectrum. 59 (1): 41.
  34. Tong, Zongli, ed. (16 October 2007). "李学勇：中国希望参加国际空间站计划". People's Daily (in Chinese). Archived from the original on 15 November 2017.
  35. de Selding, Peter B. (3 February 2010). "ESA Chief Lauds Renewed U.S. Commitment to Space Station, Earth Science". SpaceNews. Retrieved 30 December 2020.
  36. "Cooperation & Exchange". cmse.gov.cn. China Manned Space Engineering Office. Archived from the original on 8 May 2011.
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