The Space Shuttle main engine weighs 1/7th as much as a train engine but delivers as much horsepower as 39 locomotives.
147
The density of Saturn is so low that if you were to put it in a giant glass of water it would float.
219
The temperature of the earth's interior increases by 1 degree every 60 feet down.
115
A 100-pound person on Earth would weigh 38 pounds on Mars.
102
An organisation called Mars One is planning to establish a permanent colony of humans on Mars by 2023.
9
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
There are approximately 3,500 astronomers in the U.S. - but over 15,000 astrologers.
124