what's out there???

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Across
  1. 1. 8+8=_ many rings for this planet.
  2. 3. It has 12 rings.
  3. 6. Drives on one other planet.
  4. 8. May be on Mars.
  5. 9. A special comet.
  6. 11. Closest to the sun.
  7. 12. Takes you to other planets.
  8. 14. A Chocolate bar.
Down
  1. 2. It never ends.
  2. 4. Formed around 4.6 billion years ago.
  3. 5. Coldest planet.
  4. 7. Has a type of species.
  5. 10. It has a few million stars in it.
  6. 13. Keeps you on the ground.