Johanna's planet puzzler

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Across
  1. 3. you can see it at night from the Earth
  2. 4. has colorful rings around it
  3. 6. the smallest planet
  4. 7. largest planet
  5. 8. the closest planet to the sun
  6. 9. all the planets revolve around it
Down
  1. 1. named after a Greek goddess
  2. 2. the planet that has the most water
  3. 5. the blue planet
  4. 8. the red planet