Mars had an oxygen-rich atmosphere around 4 billion years ago
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
More than 20 million meteoroids enter Earth's atmosphere every day.
139
It would take more than 150 years to drive a car to the sun.
569
Venus is the only planet that rotates clockwise.
310
The population of the Earth has more than doubled since 1950.
151
Buzz Aldrin’s mother’s maiden name was Moon.
9
The center of the galaxy tastes like raspberries and smells like rum, according to astronomers.
4