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
The population of the Earth has more than doubled since 1950.
151
The temperature of the earth's interior increases by 1 degree every 60 feet down.
115
Sound doesn't travel in space.
255
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
All of the Earth's continents are wider at the north than in the south - and nobody knows why.
194
The Space Shuttle main engine weighs 1/7th as much as a train engine but delivers as much horsepower as 39 locomotives.
147