The population of the Earth has more than doubled since 1950.
151
Saturn's moon, Mimas, not only looks like the Death Star, it also has a Pac Man heat signature.
15
The Space Shuttle main engine weighs 1/7th as much as a train engine but delivers as much horsepower as 39 locomotives.
147
One pinhead of the sun's energy is enough to kill a person at a distance of 160 kilometers.
277
A 100-pound person on Earth would weigh 38 pounds on Mars.
102
Only 55% of Americans know that the sun is a star.
986
The earth travels through space at 660,000 miles per hour.
189
An organisation called Mars One is planning to establish a permanent colony of humans on Mars by 2023.
9