It takes a photon 170,000 years to travel from the core of the Sun to the surface, but only 8 minutes to travel the rest of the way to Earth.
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NASA invented baby food as we know it today.
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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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If NASA sent birds into space they would soon die; they need gravity to swallow.
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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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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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