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
Some asteroids have other asteroids orbiting them.
131
Sound doesn't travel in space.
255
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
An organisation called Mars One is planning to establish a permanent colony of humans on Mars by 2023.
9
The Earth weighs around 6,600,000,000,000,000,000,000 tons (5,940 billion billion metric tons)!
221
The sun puts out more power in 1 second than mankind has ever used within human existence.
14