Space

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Across
  1. 3. Hottest of them all
  2. 8. The one with the rings
  3. 9. Used to be a planet
  4. 10. Coldest of them all
Down
  1. 1. Earths neighbours
  2. 2. Small of them all
  3. 4. Neptunes brother
  4. 5. Biggest of them all
  5. 6. Lights the sky at night
  6. 7. We live here
  7. 8. The Centre of the Galaxy