An organisation called Mars One is planning to establish a permanent colony of humans on Mars by 2023.
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Mars had an oxygen-rich atmosphere around 4 billion years ago
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One pinhead of the sun's energy is enough to kill a person at a distance of 160 kilometers.
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There are approximately 3,500 astronomers in the U.S. - but over 15,000 astrologers.
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Some asteroids have other asteroids orbiting them.
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Saturn's moon, Mimas, not only looks like the Death Star, it also has a Pac Man heat signature.
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