The Planets Crossword

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Across
  1. 2. A small world with a big heart.
  2. 4. Earth's superheated twin sister.
  3. 7. Planets beyond the solar system.
  4. 9. The Red Planet.
  5. 10. Jewel of the solar system.
Down
  1. 1. The farthest planet in the solar system.
  2. 3. The swiftest planet.
  3. 5. King of the planets.
  4. 6. The original ice giant.
  5. 8. Our homeworld.