The population of the Earth has more than doubled since 1950.
151
An international team of astronomers has spotted the farthest known gravitational lens and, as Albert Einstein predicted, it is a galaxy that deflects and intensifies the light of a much further object.
9
It takes eight and a half minutes for light to get from the sun to earth.
159
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
Tidal forces between the Earth and Moon are slowing the Earth down and pushing the Moon further away.
46
There is a mysterious and loud radio signal known as 'the space roar' that has yet to be explained.
15
There are two golf balls sitting on the moon.
721