The volume of the Earth's moon is the same as the volume of the Pacific Ocean.
178
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 heart of an astronaut actually gets smaller when in outer space.
216
Some asteroids have other asteroids orbiting them.
131
The moon is actually moving away from Earth at a rate of 1.5 inches per year.
236
Saturn's rings are about 500,000 miles in circumference but only about a foot thick.
160