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Science can be out of this world! Which of these planets is not formed mostly out of gas?

Fact Lab

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Continue with the IQ test afterwards
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Interesting fact:

Saturn has the shortest day of any of the planets, rotating on its axis every 10 hours and 34 minutes. However, it’s rather a slowpoke when it comes to orbiting the sun, taking a whopping 29.4 years to make one complete circulation. Come on, grandad!