Mars had an oxygen-rich atmosphere around 4 billion years ago
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Earth is the only planet in our solar system that's not named after a god or goddess.
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The Sun and Moon appear to be the same size because the moon is 400 times smaller than the Sun, but 400 times closer to Earth.
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An international team of astronomers has spotted the farthest known gravitational lens and, as Albert Einstein predicted, it is a galaxy that deflects and intensifies the light of a much further object.
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A comet's tail always points away from the sun.
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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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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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