SPACE!!!

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Across
  1. 2. only planet that can sustain life
  2. 4. Largest planet
  3. 5. A group of billions of stars forming one system
  4. 6. one of neptunes moons
  5. 9. has 13 moons
  6. 10. body that revolves around the earth
Down
  1. 1. has no atmosphere
  2. 3. A stone or metal massd that has entered earth from space
  3. 7. only planet that is less dense than water
  4. 8. Important star needed to sustain life on earth