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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In the last 7 years, humanity has discovered 43 potentially habitable planets.
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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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From the nitrogen in our DNA, to the calcium in our teeth, the iron in our blood, to the carbon in our apple pies - all were made in the interiors of collapsing stars; we're all made of stardust.
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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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An organisation called Mars One is planning to establish a permanent colony of humans on Mars by 2023.
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