The earth rotates more slowly on its axis in March than in September.
145
If you went out into space, you would explode before you suffocated because there's no air pressure.
149
Some asteroids have other asteroids orbiting them.
131
Sound doesn't travel in space.
255
All of the Earth's continents are wider at the north than in the south - and nobody knows why.
194
A 100-pound person on Earth would weigh 38 pounds on Mars.
102
One pinhead of the sun's energy is enough to kill a person at a distance of 160 kilometers.
277