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 puts out more power in 1 second than mankind has ever used within human existence.
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Jupiter's moon Ganymede, is larger than the planet Mercury!
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Saturn's rings are about 500,000 miles in circumference but only about a foot thick.
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In space, astronauts cannot cry properly, because there is no gravity, so the tears can't flow down their faces!
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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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A comet's tail always points away from the sun.
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