The population of the Earth has more than doubled since 1950.
151
Any space vehicle must move at a rate of 7 miles per second in order to escape the earth's gravitational pull.
121
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
One pinhead of the sun's energy is enough to kill a person at a distance of 160 kilometers.
277
The Earth gets heavier each day by tons, as meteoric dust settles on it.
118
The earth travels through space at 660,000 miles per hour.
189
A comet's tail always points away from the sun.
2