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 center of the galaxy tastes like raspberries and smells like rum, according to astronomers.
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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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More than 20 million meteoroids enter Earth's atmosphere every day.
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Some asteroids have other asteroids orbiting them.
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The density of Saturn is so low that if you were to put it in a giant glass of water it would float.
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There are approximately 3,500 astronomers in the U.S. - but over 15,000 astrologers.
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