Jupiter's moon Ganymede, is larger than the planet Mercury!
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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.
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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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Mars had an oxygen-rich atmosphere around 4 billion years ago
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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 typical spec of dust that you see floating in the air is half way in size between the Earth and a subatomic particle.
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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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There is a mysterious and loud radio signal known as 'the space roar' that has yet to be explained.
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