If two pieces of metal touch in space, they become permanently stuck together.
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If you were to cry in space, the tears would form a bubble in your eye until it's so big it moves to another spot on your face.
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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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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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