All of the Earth's continents are wider at the north than in the south - and nobody knows why.
194
A comet's tail always points away from the sun.
2
The population of the Earth has more than doubled since 1950.
151
Today's top fuel dragsters take off with more force than the space shuttle.
120
Tidal forces between the Earth and Moon are slowing the Earth down and pushing the Moon further away.
46
Mars had an oxygen-rich atmosphere around 4 billion years ago
13
Only 55% of Americans know that the sun is a star.
986
There's a mysterious dwarf planet between Mars and Jupiter called 'Ceres' which has never been visited by spacecraft or photographed in detail, however, Earth-bound telescopes reveal a large bright shining spot on the surface of this planet, the origin and nature of which are unknown.
5