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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If NASA sent birds into space they would soon die; they need gravity to swallow.
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The Sun and Moon appear to be the same size because the moon is 400 times smaller than the Sun, but 400 times closer to Earth.
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A comet's tail always points away from the sun.
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Pluto is smaller than Russia.
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Mars had an oxygen-rich atmosphere around 4 billion years ago
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Scientists have confirmed that Enceladus, one of Saturn’s moons, has a watery ocean.
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