41% of the moon is not visible from earth at any time.
103
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 sun puts out more power in 1 second than mankind has ever used within human existence.
14
If two pieces of metal touch in space, they become permanently stuck together.
808
More than 20 million meteoroids enter Earth's atmosphere every day.
139
Astronauts cannot burp in space.
232
Mars had an oxygen-rich atmosphere around 4 billion years ago
13
Sound doesn't travel in space.
255