A comet's tail always points away from the sun.
2
The population of the Earth has more than doubled since 1950.
151
The earth is .02 degrees hotter during a full moon.
157
The Earth gets 100 tons heavier every day due to falling space dust.
673
On Titan, Saturn's largest moon, the atmosphere is so thick and the gravity so low that humans could fly through it by flapping "wings" attached to their arms.
7