Pluto is smaller than Russia.
9
Saturn's moon, Mimas, not only looks like the Death Star, it also has a Pac Man heat signature.
15
Any space vehicle must move at a rate of 7 miles per second in order to escape the earth's gravitational pull.
121
There are two golf balls sitting on the moon.
721
41% of the moon is not visible from earth at any time.
103
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
The population of the Earth has more than doubled since 1950.
151