Space

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Across
  1. 2. moves repeatedly around a planet
  2. 4. solar system
  3. 5. moon
  4. 7. biological activity & largest
  5. 9. extreme temps & smallest
  6. 10. planets: closest to the sun
Down
  1. 1. similar to earth & inner planets
  2. 3. earths twin & hottest
  3. 6. red planet & coldest
  4. 8. gases & thickness