An unprotected human can survive up to 1.5 minutes in space with no permanent bodily damage.
82
There are two golf balls sitting on the moon.
721
The light hitting the earth right now is 30 thousand years old.
163
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
The Space Shuttle main engine weighs 1/7th as much as a train engine but delivers as much horsepower as 39 locomotives.
147
A 100-pound person on Earth would weigh 38 pounds on Mars.
102
It takes eight and a half minutes for light to get from the sun to earth.
159