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Important Terms, We can only see the full moon once in a month, also called Poornima,, , During the New Moon or Amavasya, about a fortnight later we cannot see the moon at all, , All the planets, their natural satellites, stars and the other objects that we see shining in the, night sky are called celestial bodies., , Stars are the celestial bodies that are made out of gases and have their own heat and light., , A group of stars is called constellations. Example: Ursa Major or Big bear. Saptarishi is the most, easily recognizable constellation., , The North Star or the Pole Star indicates the north direction and it remains in the same position., , Jupiter, Saturn and Uranus have rings of debris around them that can be seen from Earth., , The Solar System, The sun, eight planets, asteroids, meteorites form the solar system, with the Sun at the center.