In the last 7 years, humanity has discovered 43 potentially habitable planets.
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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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Astronomer Percival Lowell believed that he was the first person to observe canals on Venus, but because of a faulty adjustment of the eyepiece on his telescope, he was in fact looking at the blood vessels in his own eye.
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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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An organisation called Mars One is planning to establish a permanent colony of humans on Mars by 2023.
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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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The population of the Earth has more than doubled since 1950.
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