Jupiter's moon Ganymede, is larger than the planet Mercury!
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The volume of the Earth's moon is the same as the volume of the Pacific Ocean.
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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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A neutron star (what remains after a Super Nova) is so dense that a portion of it the size of a sugar cube would weigh as much as all of humanity, or more than all the cars in the United States.
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The Earth weighs around 6,600,000,000,000,000,000,000 tons (5,940 billion billion metric tons)!
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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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The light hitting the earth right now is 30 thousand years old.
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On Titan, Saturn's largest moon, the atmosphere is so thick and the gravity so low that humans could fly through it by flapping "wings" attached to their arms.
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