Solar System Conundrum

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Across
  1. 4. They can't decide if this ones a planet or not
  2. 6. This planet is sometimes called Earth's sister!
  3. 7. The only planet with a ring!
  4. 8. This planet is closest to the star the planets orbit
  5. 10. The name of the Galaxy our solar system is in!
Down
  1. 1. The largest planet of them all!
  2. 2. This thing orbits the 3rd planet!
  3. 3. What is the name of the star the planets orbit?
  4. 5. There's a belt of these after mars!
  5. 9. What is the name of the 3rd planet?