An organisation called Mars One is planning to establish a permanent colony of humans on Mars by 2023.
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More than 20 million meteoroids enter Earth's atmosphere every day.
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The population of the Earth has more than doubled since 1950.
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Some asteroids have other asteroids orbiting them.
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Venus is the only planet that rotates clockwise.
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Astronauts get taller when they are in space.
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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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