Mars had an oxygen-rich atmosphere around 4 billion years ago
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Scientists have confirmed that Enceladus, one of Saturn’s moons, has a watery ocean.
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There's a mysterious dwarf planet between Mars and Jupiter called 'Ceres' which has never been visited by spacecraft or photographed in detail, however, Earth-bound telescopes reveal a large bright shining spot on the surface of this planet, the origin and nature of which are unknown.
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Venus is the only planet that rotates clockwise.
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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 organisation called Mars One is planning to establish a permanent colony of humans on Mars by 2023.
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In the last 7 years, humanity has discovered 43 potentially habitable planets.
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Some asteroids have other asteroids orbiting them.
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