Brooklynn's space crossword puzzle

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Across
  1. 2. relating to the heavens or skies
  2. 4. a spaceship to travel in space
  3. 6. ice and dust ball
  4. 8. the path a planet travels around the sun
  5. 12. has to do with the moon
  6. 14. a measure of distance in space
  7. 16. small rocky objects that orbit the sun
  8. 17. a straight line around which Earth turns on
  9. 18. the turning of earth
  10. 19. a kind of star formation
  11. 20. Earth is in its own, milky way
Down
  1. 1. shooting stars
  2. 3. a single turn the Earth makes every year that in its orbit around the sun
  3. 5. Earth, space and all things in it
  4. 7. turns from day to night
  5. 9. something to see the stars with
  6. 10. movement, something that moves around
  7. 11. a man-made object that orbits Earth
  8. 13. the study of space
  9. 15. has to do with the sun