Mars had an oxygen-rich atmosphere around 4 billion years ago
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The last time that the Sun was in its current position in space around the Milky Way, dinosaurs ruled the Earth.
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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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Jupiter's magnetosphere is the largest single structure inside the Solar System. If you could see it with your eyes, it would appear larger than our full Moon.
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MDIF, a New York based non-profit organisation, is planning to beam free Wi-Fi to the entire world from space.
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