Summer on Uranus lasts for 21 years.
358
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
An organisation called Mars One is planning to establish a permanent colony of humans on Mars by 2023.
9
Mars had an oxygen-rich atmosphere around 4 billion years ago
13
Approximately 115 tons of ocean salt spray enters the earth's atmosphere each second.
100
A 100-pound person on Earth would weigh 38 pounds on Mars.
102