1 Complete the sentences with these words.


atmosphere galaxy gravity orbits

planet solar system stars universe



1 The ___planet____ Jupiter has four moons.

2 We don’t know of any other planets in our ___Solar System___ which support life.

3 The Moon __orbits___ the Earth once every 29 days.

4 There are billions of planets in our

___galaxy____.

5 The Pleiades is a group of seven ___stars___.

6 __Gravity___ is a powerful, invisible force.

7 Earth can’t be the only planet in the __Universe___ that can support life.

8 Our planet supports life because it has an __Atmosphere___.