41% of the moon is not visible from earth at any time.
103
An international team of astronomers has spotted the farthest known gravitational lens and, as Albert Einstein predicted, it is a galaxy that deflects and intensifies the light of a much further object.
9
Earth is the only planet in our solar system that's not named after a god or goddess.
17
Lightning strikes about 6,000 times per minute on this planet!
158
Saturn's rings are about 500,000 miles in circumference but only about a foot thick.
160
Sound doesn't travel in space.
255
A lightning bolt generates temperatures five times hotter than those found at the sun's surface!
127