It takes a photon 170,000 years to travel from the core of the Sun to the surface, but only 8 minutes to travel the rest of the way to Earth.
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Scientists have confirmed that Enceladus, one of Saturn’s moons, has a watery ocean.
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If NASA sent birds into space they would soon die; they need gravity to swallow.
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An unprotected human can survive up to 1.5 minutes in space with no permanent bodily damage.
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Neil Armstrong, the first man to step foot on the moon, carried with him a piece of cloth and wood from the original 1903 Wright Flyer.
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The Sun and Moon appear to be the same size because the moon is 400 times smaller than the Sun, but 400 times closer to Earth.
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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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If you were to cry in space, the tears would form a bubble in your eye until it's so big it moves to another spot on your face.
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