Space and some other things.

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Across
  1. 4. The name of the planet closest to the sun.
  2. 9. Verse that rhymes.
  3. 10. What optical instrument helps us see further?
  4. 13. This vehicle goes into space and returns to Earth to be reused.
  5. 14. What are the initials of the International Space Station?
  6. 17. The number before three.
  7. 18. The red planet
  8. 20. Another word for spaceman.
Down
  1. 1. What do we call the collection of gases that cover or surrounds a planet?
  2. 2. What keeps us standing on the Earth and stops us from floating up into space?
  3. 3. Above and below a burger, rhymes with sun.
  4. 5. Which is the largest planet in our solar system called?
  5. 6. How many doors are there usually in an airlock?
  6. 7. Opposite of 'no'.
  7. 8. If something travels around and around above a planet, what do we say it is in?
  8. 11. This is used to hit a baseball, it's a baseball---
  9. 12. This is at the centre of our solar system.
  10. 13. Name a planet beginning with the letter 'S' that has rings around it.
  11. 15. What is another name for your tummy?
  12. 16. Another word for a shooting star.
  13. 19. The word lunar relates to one of these six words. Which one is correct? mean/mars/moan/moon/mile/mown