The Earth weighs around 6,600,000,000,000,000,000,000 tons (5,940 billion billion metric tons)!
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A lightning bolt generates temperatures five times hotter than those found at the sun's surface!
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Astronauts get taller when they are in space.
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Sound doesn't travel in space.
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The heart of an astronaut actually gets smaller when in outer space.
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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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