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
Venus is the only planet that rotates clockwise.
310
The moon is actually moving away from Earth at a rate of 1.5 inches per year.
236
The population of the Earth has more than doubled since 1950.
151
If two pieces of metal touch in space, they become permanently stuck together.
808
There are two golf balls sitting on the moon.
721
A comet's tail always points away from the sun.
2