There is a mysterious and loud radio signal known as 'the space roar' that has yet to be explained.
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Neil Armstrong, the first man to step foot on the moon, carried with him a piece of cloth and wood from the original 1903 Wright Flyer.
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If two pieces of metal touch in space, they become permanently stuck together.
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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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According to a study by the National Science Foundation, only half of Americans believe in evolution, and one in 4 don't know that the Earth orbits the Sun.
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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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