It 'snows' metal on Venus.
13
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
The Sun and Moon appear to be the same size because the moon is 400 times smaller than the Sun, but 400 times closer to Earth.
13
The density of Saturn is so low that if you were to put it in a giant glass of water it would float.
219
There is a mysterious and loud radio signal known as 'the space roar' that has yet to be explained.
15
Summer on Uranus lasts for 21 years.
358
MDIF, a New York based non-profit organisation, is planning to beam free Wi-Fi to the entire world from space.
18
The last time that the Sun was in its current position in space around the Milky Way, dinosaurs ruled the Earth.
10