Mars had an oxygen-rich atmosphere around 4 billion years ago
13
Tidal forces between the Earth and Moon are slowing the Earth down and pushing the Moon further away.
46
A neutron star (what remains after a Super Nova) is so dense that a portion of it the size of a sugar cube would weigh as much as all of humanity, or more than all the cars in the United States.
5
The temperature of the earth's interior increases by 1 degree every 60 feet down.
115
The population of the Earth has more than doubled since 1950.
151
If you went out into space, you would explode before you suffocated because there's no air pressure.
149
Saturn's moon, Mimas, not only looks like the Death Star, it also has a Pac Man heat signature.
15
41% of the moon is not visible from earth at any time.
103