Is there no Planet B? Vocab

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Across
  1. 3. Person who flies airships in space.
  2. 5. Keep something or someone safe.
  3. 6. Vehicle meant to travel through space.
  4. 8. Has a flaw, is not well-built.
  5. 11. Scientific protocol to understand something.
  6. 12. Person training for a certain job.
  7. 14. Person who discovers and occupies a new place.
  8. 16. Person working to invent satellites or ways to communicate with astronauts.
  9. 17. Projectile that flies upwards into space.
  10. 19. Unfriendly, dangerous.
Down
  1. 1. Transform a planet into Earth.
  2. 2. Feeling of believing in the success of something?
  3. 4. Where plants and wildlife can grow.
  4. 7. Person who funds an invention so it can bring them money.
  5. 9. Person who travels through space.
  6. 10. Can be lived on.
  7. 13. Concerning, worrying.
  8. 15. Where plants and wildlife can not survive.
  9. 18. Verb used to say "mener (une expérience)"
  10. 20. Put people or species in a bad situation.