Trevor's space puzzl

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Across
  1. 2. every planets rocks stars
  2. 3. a rock that enters earths atmosphere
  3. 4. tiny rocks in space
  4. 9. the measurement of space
  5. 12. the moon going over the sun
  6. 13. an imaginary reference line drawn through an object
  7. 14. have to do with mathematics and geology
  8. 15. planet or man made machine
  9. 18. stars lining up in the sky
  10. 20. the objects orbital motion around another object
Down
  1. 1. relating to heaven
  2. 5. man made rocket ship
  3. 6. have to do with the sun
  4. 7. the turning of something
  5. 8. an object staying around another object
  6. 10. a bunch of stuff held up by gravity
  7. 11. something you look in to space with
  8. 16. have to do with the moon
  9. 17. crushed up ice and rocks in space
  10. 19. moving