Jupiter's moon Ganymede, is larger than the planet Mercury!
149
The heart of an astronaut actually gets smaller when in outer space.
216
An unprotected human can survive up to 1.5 minutes in space with no permanent bodily damage.
82
Saturn's rings are about 500,000 miles in circumference but only about a foot thick.
160
There is a mass reservoir of water floating in space that is 100,000 times bigger than our sun and holds 140 trillion times more water than all of our oceans.
11
The temperature of the earth's interior increases by 1 degree every 60 feet down.
115
The Space Shuttle main engine weighs 1/7th as much as a train engine but delivers as much horsepower as 39 locomotives.
147
41% of the moon is not visible from earth at any time.
103