From the nitrogen in our DNA, to the calcium in our teeth, the iron in our blood, to the carbon in our apple pies - all were made in the interiors of collapsing stars; we're all made of stardust.
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Mars had an oxygen-rich atmosphere around 4 billion years ago
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Saturn's moon, Mimas, not only looks like the Death Star, it also has a Pac Man heat signature.
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The last time that the Sun was in its current position in space around the Milky Way, dinosaurs ruled the Earth.
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A comet's tail always points away from the sun.
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