3. The Planets

    Planets are celestial bodies that do not produce their own light; however, they receive their light from the Sun or from other stars. They are opaque. They revolve around a star, and the path they follow is known as an orbit.

    Planets have two motions: one of translation around a star, and another one of rotation on their own axis.

    4. The Satellites

    Satellites are celestial bodies that are opaque and non-luminous. Instead, they reflect off the light of a star. We can see them in the sky giving off a more pale light.

    Every satellite revolves around its own planet following its own orbit as well as rotating on its own axis.    The Moon is Earth’s satellite.

 B). Indicate whether the parts below are from a planet, satellite or comet

       7. The Constellations

    Constellations are an ensemble of stars that look like figures, even if they are just arbitrary groupings.

    In the Northern Hemisphere, we can spot the Big Dipper and the Little Dipper, which have the Polar Star. This star serves to facilitate our orientation, since it signals towards the North Pole.

    In the Southern Hemisphere, we can spot the Southern Cross and the twelve constellations of the Zodiac: Aries, Taurus, Gemini, Cancer, Leo, Virgo, Libra, Scorpio, Sagittarius, Aquarius, Capricorn and Pisces. Each one corresponds to the twelve months of the year.