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
Saturn's rings are about 500,000 miles in circumference but only about a foot thick.
160
Mars had an oxygen-rich atmosphere around 4 billion years ago
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
Earth is the only planet in our solar system that's not named after a god or goddess.
17
The population of the Earth has more than doubled since 1950.
151
41% of the moon is not visible from earth at any time.
103
It 'snows' metal on Venus.
13