Planet Puzzle

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Across
  1. 4. how far does Saturn's ring system extend
  2. 5. This planet has the most powerful magnetic field
  3. 6. How many Earth days does one Venus day/night cycle take
  4. 8. What did William Hershell try to name Uranus
Down
  1. 1. A magnetic reversal on earth can happen every how many years?
  2. 2. This planet has six rings
  3. 3. This planet is closest to the sun but not actually the hotest
  4. 7. Mars has a volcano that's bigger than which Earth mountain