Planetary Transformation

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Across
  1. 2. friend or foe?
  2. 3. the Red planet
  3. 5. humans lose this density in space
  4. 7. occurring between planets
  5. 11. radio waves, infrared, X, and gamma rays
  6. 13. gases surrounding planets
  7. 14. to take control of or settle
Down
  1. 1. bodies found in space
  2. 4. O3
  3. 6. force causing bodies to fall towards center of earth
  4. 8. faction or fantasy
  5. 9. indicates we may not be alone in the cosmos
  6. 10. founder of SpaceX
  7. 12. other body likely to be transformed
  8. 15. leader in space exploration