The last time that the Sun was in its current position in space around the Milky Way, dinosaurs ruled the Earth.
10
The heart of an astronaut actually gets smaller when in outer space.
216
There are two golf balls sitting on the moon.
721
The population of the Earth has more than doubled since 1950.
151
Astronauts cannot burp in space.
232
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
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