In space, astronauts cannot cry properly, because there is no gravity, so the tears can't flow down their faces!
175
Summer on Uranus lasts for 21 years.
358
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
Only 55% of Americans know that the sun is a star.
986
The moon is actually moving away from Earth at a rate of 1.5 inches per year.
236
The light hitting the earth right now is 30 thousand years old.
163
Astronauts get taller when they are in space.
224
It 'snows' metal on Venus.
13