Discovering Mars

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Across
  1. 3. a hole made by an impact
  2. 4. a traveler in a spacecraft
  3. 6. globe shaped body
  4. 8. permanently Frozen
  5. 9. the envelope of gases surrounding the earth or another planet
Down
  1. 1. to stop or hinder
  2. 2. to move around something
  3. 5. calling for important attention
  4. 6. system consisting of the Sun and everything that orbits
  5. 7. either one of an axis