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 population of the Earth has more than doubled since 1950.
151
A comet's tail always points away from the sun.
2
There are approximately 3,500 astronomers in the U.S. - but over 15,000 astrologers.
124
The earth rotates more slowly on its axis in March than in September.
145
Pluto is smaller than Russia.
9
The temperature of the earth's interior increases by 1 degree every 60 feet down.
115