Mars colonization

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Across
  1. 2. The way the rain goes to clear
  2. 5. needs to be planted or inhabited with good soil and crops
  3. 7. only planet with water besides earth
  4. 9. planet we live on
  5. 10. company that deals with space
  6. 12. what they use to move
  7. 14. outside of earth the blackout
  8. 16. adding more people to a place
  9. 17. used to grow crops
  10. 19. spiece on another planet
  11. 20. force that pulls everything to the ground
Down
  1. 1. who gave the idea
  2. 3. produce oxygen
  3. 4. basic essential that humans need and are made up of
  4. 6. means explorer
  5. 8. the plane like object that launches into space
  6. 11. The amount of space the thing takes up
  7. 13. another word for space
  8. 15. someone who explores space
  9. 18. declares ownership