5. Jupiter
Gargantuan Jupiter is the largest planet in the solar system. Its mass is two and a half times that of all the other planets in the solar system combined! However, Jupiter is primarily composed of gases.
Jupiter has the shortest day in the solar system: it turns on its axis once every 9 hours and 55 minutes. Rotating at that speed causes the planet to flatten slightly, so it has an oblong shape.
source: Wikipedia
There will be big Jupiter news later this year, as a probe called Juno is set to arrive on the planet in July 2016.
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