The temperature of the earth's interior increases by 1 degree every 60 feet down.
115
The last time that the Sun was in its current position in space around the Milky Way, dinosaurs ruled the Earth.
10
Astronomer Percival Lowell believed that he was the first person to observe canals on Venus, but because of a faulty adjustment of the eyepiece on his telescope, he was in fact looking at the blood vessels in his own eye.
4
The earth travels through space at 660,000 miles per hour.
189
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
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