Mars had an oxygen-rich atmosphere around 4 billion years ago
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If you were to cry in space, the tears would form a bubble in your eye until it's so big it moves to another spot on your face.
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More than 20 million meteoroids enter Earth's atmosphere every day.
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Astronauts get taller when they are in space.
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There are approximately 3,500 astronomers in the U.S. - but over 15,000 astrologers.
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The sun puts out more power in 1 second than mankind has ever used within human existence.
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