The temperature of the earth's interior increases by 1 degree every 60 feet down.
115
Tidal forces between the Earth and Moon are slowing the Earth down and pushing the Moon further away.
46
Any space vehicle must move at a rate of 7 miles per second in order to escape the earth's gravitational pull.
121
Sound doesn't travel in space.
255
A 100-pound person on Earth would weigh 38 pounds on Mars.
102
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
Astronauts cannot burp in space.
232