The last time that the Sun was in its current position in space around the Milky Way, dinosaurs ruled the Earth.
10
On Titan, Saturn's largest moon, the atmosphere is so thick and the gravity so low that humans could fly through it by flapping "wings" attached to their arms.
7
It 'snows' metal on Venus.
13
The population of the Earth has more than doubled since 1950.
151
The earth rotates more slowly on its axis in March than in September.
145
The Earth weighs around 6,600,000,000,000,000,000,000 tons (5,940 billion billion metric tons)!
221