The heart of an astronaut actually gets smaller when in outer space.
216
Earth is the only planet in our solar system that's not named after a god or goddess.
17
Astronauts cannot burp in space.
232
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
One pinhead of the sun's energy is enough to kill a person at a distance of 160 kilometers.
277
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
All of the Earth's continents are wider at the north than in the south - and nobody knows why.
194
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