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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In the last 7 years, humanity has discovered 43 potentially habitable planets.
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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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Pluto is smaller than Russia.
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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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According to a study by the National Science Foundation, only half of Americans believe in evolution, and one in 4 don't know that the Earth orbits the Sun.
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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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