1. It is estimated that Jupiter shrinks 2cm every year. When it was first created, it was twice as big as it is now.
  2. Jupiter has 67 moons.
  3. Jupiter is named for the Roman god of the sky. The Greek equivalent is Zeus.
  4. A day on Jupiter only lasts 9 hours and 55 minutes.
  5. Jupiter emits more radiation than it receives.
  6. There are two smaller storms next to the Great Red Spot.
  7. In 2009, an object the size of the Titanic crashed into Jupiter, leaving an ocean sized scar.
  8. Jupiter is where boys go to get more stupider.
    Suggested by @LevNovak