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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The earth travels through space at 660,000 miles per hour.
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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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There is a mysterious and loud radio signal known as 'the space roar' that has yet to be explained.
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All of the Earth's continents are wider at the north than in the south - and nobody knows why.
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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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Scientists have confirmed that Enceladus, one of Saturn’s moons, has a watery ocean.
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