Mars had an oxygen-rich atmosphere around 4 billion years ago
13
The density of Saturn is so low that if you were to put it in a giant glass of water it would float.
219
Tidal forces between the Earth and Moon are slowing the Earth down and pushing the Moon further away.
46
Approximately 115 tons of ocean salt spray enters the earth's atmosphere each second.
100
In space, astronauts cannot cry properly, because there is no gravity, so the tears can't flow down their faces!
175
Venus is the only planet that rotates clockwise.
310