The population of the Earth has more than doubled since 1950.
151
A comet's tail always points away from the sun.
2
One pinhead of the sun's energy is enough to kill a person at a distance of 160 kilometers.
277
Jupiter is bigger than all the other planets combined.
254
Any space vehicle must move at a rate of 7 miles per second in order to escape the earth's gravitational pull.
121
Saturn's rings are about 500,000 miles in circumference but only about a foot thick.
160
Mars had an oxygen-rich atmosphere around 4 billion years ago
13
The sun puts out more power in 1 second than mankind has ever used within human existence.
14