If two pieces of metal touch in space, they become permanently stuck together.
808
Sound doesn't travel in space.
255
Summer on Uranus lasts for 21 years.
358
It takes a photon 170,000 years to travel from the core of the Sun to the surface, but only 8 minutes to travel the rest of the way to Earth.
6
It 'snows' metal on Venus.
13
The light hitting the earth right now is 30 thousand years old.
163
An organisation called Mars One is planning to establish a permanent colony of humans on Mars by 2023.
9