Jupiter's moon Ganymede, is larger than the planet Mercury!
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Saturn's rings are about 500,000 miles in circumference but only about a foot thick.
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The ashes of the man who discovered Pluto are currently en route to dwarf planet, scheduled to arrive on the 14th of July, 2015.
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The population of the Earth has more than doubled since 1950.
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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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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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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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