The heart of an astronaut actually gets smaller when in outer space.
216
More than 20 million meteoroids enter Earth's atmosphere every day.
139
Tidal forces between the Earth and Moon are slowing the Earth down and pushing the Moon further away.
46
41% of the moon is not visible from earth at any time.
103
The temperature of the earth's interior increases by 1 degree every 60 feet down.
115
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 Earth gets heavier each day by tons, as meteoric dust settles on it.
118
A lightning bolt generates temperatures five times hotter than those found at the sun's surface!
127