An organisation called Mars One is planning to establish a permanent colony of humans on Mars by 2023.
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A comet's tail always points away from the sun.
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Tidal forces between the Earth and Moon are slowing the Earth down and pushing the Moon further away.
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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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Scientists have confirmed that Enceladus, one of Saturn’s moons, has a watery ocean.
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