More than 20 million meteoroids enter Earth's atmosphere every day.
139
There are two golf balls sitting on the moon.
721
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
Earth is the only planet in our solar system that's not named after a god or goddess.
17
Any space vehicle must move at a rate of 7 miles per second in order to escape the earth's gravitational pull.
121
Sound doesn't travel in space.
255
Some asteroids have other asteroids orbiting them.
131
If two pieces of metal touch in space, they become permanently stuck together.
808