An organisation called Mars One is planning to establish a permanent colony of humans on Mars by 2023.
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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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Jupiter is bigger than all the other planets combined.
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One pinhead of the sun's energy is enough to kill a person at a distance of 160 kilometers.
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There are approximately 3,500 astronomers in the U.S. - but over 15,000 astrologers.
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Jupiter's moon Ganymede, is larger than the planet Mercury!
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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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An unprotected human can survive up to 1.5 minutes in space with no permanent bodily damage.
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