Planetary Science Crossword

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Across
  1. 2. moon galaxy
  2. 3. Crater
  3. 4. system
  4. 6. line
  5. 11. Period
  6. 12. of reference
  7. 14. gravity
  8. 15. light
  9. 16. giant
Down
  1. 1. spectrum
  2. 5. Bang Theory
  3. 7. meteoro Milky Way
  4. 8. Star
  5. 9. Belt
  6. 10. fuel
  7. 13. dwarf
  8. 17. planet