A comet's tail always points away from the sun.
2
In space, astronauts cannot cry properly, because there is no gravity, so the tears can't flow down their faces!
175
The population of the Earth has more than doubled since 1950.
151
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 sun puts out more power in 1 second than mankind has ever used within human existence.
14
The density of Saturn is so low that if you were to put it in a giant glass of water it would float.
219