planets

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Across
  1. 3. 8th or last cold planet
  2. 4. 4th hot planet
  3. 7. 7th cold planet
  4. 8. 5th cold planet that's very big
Down
  1. 1. 1st hot planet
  2. 2. 2nd hot planet
  3. 5. 6th cold planet
  4. 6. 3rd hot but not too hot planet