A comet's tail always points away from the sun.
2
The earth travels through space at 660,000 miles per hour.
189
If you went out into space, you would explode before you suffocated because there's no air pressure.
149
Neil Armstrong, the first man to step foot on the moon, carried with him a piece of cloth and wood from the original 1903 Wright Flyer.
12
The population of the Earth has more than doubled since 1950.
151
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