Space

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Across
  1. 4. only thing stepped by man kind on apart from Earth
  2. 5. faint rings
  3. 7. once a planet but not any more
  4. 8. closest to sun
Down
  1. 1. hottest planet
  2. 2. only planet with water
  3. 3. biggest planet
  4. 6. float in water
  5. 8. red planet