An organisation called Mars One is planning to establish a permanent colony of humans on Mars by 2023.
9
If two pieces of metal touch in space, they become permanently stuck together.
808
Approximately 115 tons of ocean salt spray enters the earth's atmosphere each second.
100
Only 55% of Americans know that the sun is a star.
986
The typical spec of dust that you see floating in the air is half way in size between the Earth and a subatomic particle.
131
If you went out into space, you would explode before you suffocated because there's no air pressure.
149
All of the Earth's continents are wider at the north than in the south - and nobody knows why.
194