Earth is the only planet in our solar system that's not named after a god or goddess.
17
Astronauts get taller when they are in space.
224
The population of the Earth has more than doubled since 1950.
151
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
Sound doesn't travel in space.
255
There are 5 to 10 times more stars in the known Universe than there are grains of sand on all the world's beaches, but a single grain of sand has more atoms than there are stars in the known Universe.
20
The moon is actually moving away from Earth at a rate of 1.5 inches per year.
236
Approximately 115 tons of ocean salt spray enters the earth's atmosphere each second.
100