All of the Earth's continents are wider at the north than in the south - and nobody knows why.
194
41% of the moon is not visible from earth at any time.
103
Astronauts cannot burp in space.
232
The population of the Earth has more than doubled since 1950.
151
Sound doesn't travel in space.
255
An unprotected human can survive up to 1.5 minutes in space with no permanent bodily damage.
82
The last time that the Sun was in its current position in space around the Milky Way, dinosaurs ruled the Earth.
10
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