All of the Earth's continents are wider at the north than in the south - and nobody knows why.
194
In the last 7 years, humanity has discovered 43 potentially habitable planets.
14
The heart of an astronaut actually gets smaller when in outer space.
216
Saturn's rings are about 500,000 miles in circumference but only about a foot thick.
160
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
Saturn's moon, Mimas, not only looks like the Death Star, it also has a Pac Man heat signature.
15
Pluto is smaller than Russia.
9