Mars Vocabulary

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Across
  1. 5. a linear or square rod
  2. 6. the envelope of gasses surrounding the Earth
  3. 8. Unwelcome intrusion
  4. 12. transform a planet to resemble Earth
  5. 13. the curved object of a celestial object
  6. 14. A person who observes the stars
  7. 15. Gaining control of a place
  8. 17. Required immediately
Down
  1. 1. any ground that remains completely frozen
  2. 2. A length of water wider than a strait
  3. 3. a celestial body that moves in orbit
  4. 4. the end of an event
  5. 7. A small body of matter from Outer Space
  6. 9. a person who is trained to travel in a spacecraft
  7. 10. The natural satellite of the Earth
  8. 11. to stop the process
  9. 16. A round solid figure