Only 55% of Americans know that the sun is a star.
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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.
12
In space, astronauts cannot cry properly, because there is no gravity, so the tears can't flow down their faces!
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Approximately 115 tons of ocean salt spray enters the earth's atmosphere each second.
100
Mars had an oxygen-rich atmosphere around 4 billion years ago
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