An organisation called Mars One is planning to establish a permanent colony of humans on Mars by 2023.
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There is a mysterious and loud radio signal known as 'the space roar' that has yet to be explained.
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Mars had an oxygen-rich atmosphere around 4 billion years ago
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Any space vehicle must move at a rate of 7 miles per second in order to escape the earth's gravitational pull.
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Today's top fuel dragsters take off with more force than the space shuttle.
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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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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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