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 Space Shuttle main engine weighs 1/7th as much as a train engine but delivers as much horsepower as 39 locomotives.
147
The density of Saturn is so low that if you were to put it in a giant glass of water it would float.
219
Earth is the only planet in our solar system that's not named after a god or goddess.
17
Saturn's rings are about 500,000 miles in circumference but only about a foot thick.
160
The Earth gets heavier each day by tons, as meteoric dust settles on it.
118
The sun puts out more power in 1 second than mankind has ever used within human existence.
14
The heart of an astronaut actually gets smaller when in outer space.
216