science things that I will totally use when i'm older

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Across
  1. 3. other blue planet
  2. 7. huge rock in solar system
  3. 11. green planet
  4. 13. distance light goes in a year
  5. 14. planet with acid
  6. 15. red planet
  7. 17. blue planet
  8. 19. cluster of stars that form a picture
  9. 20. thing that holds the solar system together
Down
  1. 1. black thing that sucks up stuff in space
  2. 2. ball of light
  3. 4. hugest gas planet
  4. 5. planet with rings
  5. 6. small planet
  6. 8. thing that helps us see in the sky
  7. 9. gut that explores space
  8. 10. cluster of stars
  9. 12. different balls of light
  10. 16. scary unknown green dude
  11. 18. small and not a planet