Some asteroids have other asteroids orbiting them.
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The earth travels through space at 660,000 miles per hour.
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Astronauts get taller when they are in space.
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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.
7
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.
12
41% of the moon is not visible from earth at any time.
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