Space Crossword Puzzle

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Across
  1. 2. beyond neptune
  2. 3. amount of matter
  3. 10. night
  4. 11. multiple quantities
  5. 12. night sky shining
  6. 13. earliest known periods
  7. 15. earth; Neptune; etc.
  8. 16. instrument to see stars
  9. 17. sphere activity
  10. 18. night sky ice and dust
  11. 20. astronomical distance
Down
  1. 1. shaped in solar system
  2. 4. rotate on
  3. 5. sun is center
  4. 6. object in space
  5. 7. sky; universe
  6. 8. all the planets
  7. 9. around earth; object
  8. 14. star wars
  9. 19. icy surround sun