The Earth weighs around 6,600,000,000,000,000,000,000 tons (5,940 billion billion metric tons)!
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Scientists have confirmed that Enceladus, one of Saturn’s moons, has a watery ocean.
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On Titan, Saturn's largest moon, the atmosphere is so thick and the gravity so low that humans could fly through it by flapping "wings" attached to their arms.
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A 100-pound person on Earth would weigh 38 pounds on Mars.
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Today's top fuel dragsters take off with more force than the space shuttle.
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An organisation called Mars One is planning to establish a permanent colony of humans on Mars by 2023.
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The earth rotates more slowly on its axis in March than in September.
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There are approximately 3,500 astronomers in the U.S. - but over 15,000 astrologers.
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