41% of the moon is not visible from earth at any time.
103
More than 20 million meteoroids enter Earth's atmosphere every day.
139
Today's top fuel dragsters take off with more force than the space shuttle.
120
If two pieces of metal touch in space, they become permanently stuck together.
808
An unprotected human can survive up to 1.5 minutes in space with no permanent bodily damage.
82
The moon is actually moving away from Earth at a rate of 1.5 inches per year.
236
Mars had an oxygen-rich atmosphere around 4 billion years ago
13
Any space vehicle must move at a rate of 7 miles per second in order to escape the earth's gravitational pull.
121