41% of the moon is not visible from earth at any time.
103
Sound doesn't travel in space.
255
One pinhead of the sun's energy is enough to kill a person at a distance of 160 kilometers.
277
It 'snows' metal on Venus.
13
All of the Earth's continents are wider at the north than in the south - and nobody knows why.
194
Some asteroids have other asteroids orbiting them.
131
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 rotates more slowly on its axis in March than in September.
145