There are 5 to 10 times more stars in the known Universe than there are grains of sand on all the world's beaches, but a single grain of sand has more atoms than there are stars in the known Universe.
20
An organisation called Mars One is planning to establish a permanent colony of humans on Mars by 2023.
9
Some asteroids have other asteroids orbiting them.
131
The population of the Earth has more than doubled since 1950.
151
Mars had an oxygen-rich atmosphere around 4 billion years ago
13
Today's top fuel dragsters take off with more force than the space shuttle.
120
Any space vehicle must move at a rate of 7 miles per second in order to escape the earth's gravitational pull.
121
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