Planet Puzzle

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Across
  1. 3. the planet farthest from the sun
  2. 4. the only star in our solar system
  3. 6. the galaxy we live in
  4. 7. the biggest planet
  5. 8. the smallest of the planets
Down
  1. 1. the planet with the most visible rings
  2. 2. the hottest planet
  3. 5. the blue planet
  4. 6. the red planet
  5. 9. the only planet with human life