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 population of the Earth has more than doubled since 1950.
151
The Sun and Moon appear to be the same size because the moon is 400 times smaller than the Sun, but 400 times closer to Earth.
13
Earth is the only planet in our solar system that's not named after a god or goddess.
17
The light hitting the earth right now is 30 thousand years old.
163
More than 20 million meteoroids enter Earth's atmosphere every day.
139
The volume of the Earth's moon is the same as the volume of the Pacific Ocean.
178