Sam's crossword puzzle

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Across
  1. 2. the study of space
  2. 7. star formation
  3. 8. a measure of distance in space
  4. 9. when light from the sun is cut of
  5. 16. a object that lets you see into space
  6. 17. a star like object made of ice and dust
  7. 18. having to do with the moon
  8. 19. earth space and all things around it
  9. 20. a path a planet travels around the sun
Down
  1. 1. a imaginary line that earth rotates on
  2. 3. the path planets take around the sun
  3. 4. having to do with the sun
  4. 5. shooting stars
  5. 6. the Milky Way
  6. 10. old space ship that does not get used any more
  7. 11. Man made object orbiting the earth
  8. 12. having to do with the heavens or skies
  9. 13. a synonym for movement
  10. 14. star like object most by Mars and Jupiter
  11. 15. turning of a object