Sound doesn't travel in space.
255
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
The population of the Earth has more than doubled since 1950.
151
It 'snows' metal on Venus.
13
The volume of the Earth's moon is the same as the volume of the Pacific Ocean.
178
41% of the moon is not visible from earth at any time.
103
Tidal forces between the Earth and Moon are slowing the Earth down and pushing the Moon further away.
46
The Space Shuttle main engine weighs 1/7th as much as a train engine but delivers as much horsepower as 39 locomotives.
147