The Space Shuttle main engine weighs 1/7th as much as a train engine but delivers as much horsepower as 39 locomotives.
147
Only 55% of Americans know that the sun is a star.
986
Saturn's moon, Mimas, not only looks like the Death Star, it also has a Pac Man heat signature.
15
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
Jupiter's moon Ganymede, is larger than the planet Mercury!
149
A 100-pound person on Earth would weigh 38 pounds on Mars.
102
Pluto is smaller than Russia.
9
In the last 7 years, humanity has discovered 43 potentially habitable planets.
14