An organisation called Mars One is planning to establish a permanent colony of humans on Mars by 2023.
9
All of the Earth's continents are wider at the north than in the south - and nobody knows why.
194
The temperature of the earth's interior increases by 1 degree every 60 feet down.
115
Saturn's rings are about 500,000 miles in circumference but only about a foot thick.
160
Earth is the only planet in our solar system that's not named after a god or goddess.
17
If you went out into space, you would explode before you suffocated because there's no air pressure.
149
The earth travels through space at 660,000 miles per hour.
189