Summer on Uranus lasts for 21 years.
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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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MDIF, a New York based non-profit organisation, is planning to beam free Wi-Fi to the entire world from space.
18
If two pieces of metal touch in space, they become permanently stuck together.
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Mars had an oxygen-rich atmosphere around 4 billion years ago
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Saturn's moon, Mimas, not only looks like the Death Star, it also has a Pac Man heat signature.
15
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.
7