3. Fill in the blanks

4. A moon moves round a _____ and a _______ moves round a star.

3. A______ is a vehicle used to travelling on the surface of the moon.

2. The aliens came out of a ______, which looked like a disk.

5. In a _______ environment, everything floats uncontrollably.

8. Vostok 1 is the name of the _____ in which Yuki Gagarin flew into outer space.

1. The_____ were green and they had huge heads and big eyes.

We don't know how many solar systems there are in each _________.

6. There are eight planets that move round the Sun in our_______.