2. REVISION

4. What protects the Earth from cosmic radiation?

5. What are cosmic rays and where do they come from?

6. What can solar flares interfere with?

7. How may the Moon have formed (3)

8. Why can we see stars when they are so far away (2)

9. Name 3 things that manned spaceships need to provide for the astronauts

10. What planet is between these two? Jupiter Uranus

11. Name two things that unmanned craft can find on a distant planet

12. What are comets made of?

13. Between which planets do asteroids orbit?

14. Give three consequences of a large asteroid hitting the Earth

15. What happens to the speed of a comet as it moves away from the Sun?

16. What is the big bang theory about the start of the universe (2)

17. What will happen when the Sun runs out of fuel (3)?

18. What happens when a large star runs out of fuel (3)?

19. What is the link between the distance a galaxy is away from us and how fast it is moving away ?