Mars had an oxygen-rich atmosphere around 4 billion years ago
13
Saturn's moon, Mimas, not only looks like the Death Star, it also has a Pac Man heat signature.
15
Any space vehicle must move at a rate of 7 miles per second in order to escape the earth's gravitational pull.
121
The heart of an astronaut actually gets smaller when in outer space.
216
Summer on Uranus lasts for 21 years.
358
Only 55% of Americans know that the sun is a star.
986
Scientists have confirmed that Enceladus, one of Saturn’s moons, has a watery ocean.
6
Earth is the only planet in our solar system that's not named after a god or goddess.
17