Sound doesn't travel in space.
255
There are approximately 3,500 astronomers in the U.S. - but over 15,000 astrologers.
124
The population of the Earth has more than doubled since 1950.
151
Tidal forces between the Earth and Moon are slowing the Earth down and pushing the Moon further away.
46
All of the Earth's continents are wider at the north than in the south - and nobody knows why.
194
If you were to cry in space, the tears would form a bubble in your eye until it's so big it moves to another spot on your face.
10
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
The temperature of the earth's interior increases by 1 degree every 60 feet down.
115