In space, astronauts cannot cry properly, because there is no gravity, so the tears can't flow down their faces!
175
An organisation called Mars One is planning to establish a permanent colony of humans on Mars by 2023.
9
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
A lightning bolt generates temperatures five times hotter than those found at the sun's surface!
127
There are two golf balls sitting on the moon.
721
The earth travels through space at 660,000 miles per hour.
189
The typical spec of dust that you see floating in the air is half way in size between the Earth and a subatomic particle.
131