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
The Space Shuttle main engine weighs 1/7th as much as a train engine but delivers as much horsepower as 39 locomotives.
147
Mars had an oxygen-rich atmosphere around 4 billion years ago
13
If you went out into space, you would explode before you suffocated because there's no air pressure.
149
A comet's tail always points away from the sun.
2
The heart of an astronaut actually gets smaller when in outer space.
216
The moon is actually moving away from Earth at a rate of 1.5 inches per year.
236