If you were to cry in space, the tears would form a bubble in your eye until it's so big it moves to another spot on your face.
10
Mars had an oxygen-rich atmosphere around 4 billion years ago
13
The Space Shuttle main engine weighs 1/7th as much as a train engine but delivers as much horsepower as 39 locomotives.
147
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 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
The earth rotates more slowly on its axis in March than in September.
145
Astronauts cannot burp in space.
232