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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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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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 two pieces of metal touch in space, they become permanently stuck together.
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It 'snows' metal on Venus.
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