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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There are approximately 3,500 astronomers in the U.S. - but over 15,000 astrologers.
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There are 5 to 10 times more stars in the known Universe than there are grains of sand on all the world's beaches, but a single grain of sand has more atoms than there are stars in the known Universe.
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Saturn's rings are about 500,000 miles in circumference but only about a foot thick.
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The population of the Earth has more than doubled since 1950.
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Tidal forces between the Earth and Moon are slowing the Earth down and pushing the Moon further away.
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