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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There are more nerve cells in the human brain than there are stars in the Milky Way.
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Pluto is smaller than Russia.
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Tidal forces between the Earth and Moon are slowing the Earth down and pushing the Moon further away.
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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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