Sound doesn't travel in space.
255
Summer on Uranus lasts for 21 years.
358
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.
12
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
It 'snows' metal on Venus.
13
Saturn's moon, Mimas, not only looks like the Death Star, it also has a Pac Man heat signature.
15