An organisation called Mars One is planning to establish a permanent colony of humans on Mars by 2023.
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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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There are 5 to 10 times more stars in the known Universe than there are grains of sand on all the world's beaches, but a single grain of sand has more atoms than there are stars in the known Universe.
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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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A 100-pound person on Earth would weigh 38 pounds on Mars.
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Pluto is smaller than Russia.
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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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