Mars had an oxygen-rich atmosphere around 4 billion years ago
13
All of the Earth's continents are wider at the north than in the south - and nobody knows why.
194
Pluto is smaller than Russia.
9
It 'snows' metal on Venus.
13
There are approximately 3,500 astronomers in the U.S. - but over 15,000 astrologers.
124
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 sun puts out more power in 1 second than mankind has ever used within human existence.
14
Venus is the only planet that rotates clockwise.
310