41% of the moon is not visible from earth at any time.
103
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
Astronauts get taller when they are in space.
224
Any space vehicle must move at a rate of 7 miles per second in order to escape the earth's gravitational pull.
121
The Earth gets 100 tons heavier every day due to falling space dust.
673
Mars had an oxygen-rich atmosphere around 4 billion years ago
13
Summer on Uranus lasts for 21 years.
358