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
Some asteroids have other asteroids orbiting them.
131
An unprotected human can survive up to 1.5 minutes in space with no permanent bodily damage.
82
The population of the Earth has more than doubled since 1950.
151
Buzz Aldrin’s mother’s maiden name was Moon.
9
An organisation called Mars One is planning to establish a permanent colony of humans on Mars by 2023.
9
Saturn's rings are about 500,000 miles in circumference but only about a foot thick.
160