Any space vehicle must move at a rate of 7 miles per second in order to escape the earth's gravitational pull.
121
Mars had an oxygen-rich atmosphere around 4 billion years ago
13
A 100-pound person on Earth would weigh 38 pounds on Mars.
102
Saturn's moon, Mimas, not only looks like the Death Star, it also has a Pac Man heat signature.
15
It takes eight and a half minutes for light to get from the sun to earth.
159
The heart of an astronaut actually gets smaller when in outer space.
216