Planets

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Across
  1. 3. Has a very thin atmosphere
  2. 4. Spins in the opposite direction
  3. 7. Spins on its side
  4. 8. Furthest from the sun
Down
  1. 1. Known as the red planet
  2. 2. Could fit all other planets inside of it
  3. 5. Flattest planet
  4. 6. 75% covered in water