The population of the Earth has more than doubled since 1950.
151
Saturn's rings are about 500,000 miles in circumference but only about a foot thick.
160
An organisation called Mars One is planning to establish a permanent colony of humans on Mars by 2023.
9
The Sun and Moon appear to be the same size because the moon is 400 times smaller than the Sun, but 400 times closer to Earth.
13
If you went out into space, you would explode before you suffocated because there's no air pressure.
149
Scientists have confirmed that Enceladus, one of Saturn’s moons, has a watery ocean.
6
A lightning bolt generates temperatures five times hotter than those found at the sun's surface!
127
