Swiftwalker: Space Adventure

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Across
  1. 2. holes on the surface of planets
  2. 7. a subject at school
  3. 9. a mountain of fire
Down
  1. 1. a red planet
  2. 3. Saturn's biggest moon
  3. 4. something we use to fly to space
  4. 5. a flying rock in space
  5. 6. Neptune's largest moon
  6. 8. the coldest planet