It 'snows' metal on Venus.
13
The heart of an astronaut actually gets smaller when in outer space.
216
There are two golf balls sitting on the moon.
721
In the last 7 years, humanity has discovered 43 potentially habitable planets.
14
In space, astronauts cannot cry properly, because there is no gravity, so the tears can't flow down their faces!
175
Saturn's rings are about 500,000 miles in circumference but only about a foot thick.
160
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