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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One pinhead of the sun's energy is enough to kill a person at a distance of 160 kilometers.
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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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Mars had an oxygen-rich atmosphere around 4 billion years ago
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A comet's tail always points away from the sun.
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