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 is 330,330 times larger than the earth!
190
Venus is the only planet that rotates clockwise.
310
Some asteroids have other asteroids orbiting them.
131
One pinhead of the sun's energy is enough to kill a person at a distance of 160 kilometers.
277
Lightning strikes about 6,000 times per minute on this planet!
158
Astronauts get taller when they are in space.
224