The Earth gets heavier each day by tons, as meteoric dust settles on it.
118
Any space vehicle must move at a rate of 7 miles per second in order to escape the earth's gravitational pull.
121
Astronauts get taller when they are in space.
224
There are approximately 3,500 astronomers in the U.S. - but over 15,000 astrologers.
124
A lightning bolt generates temperatures five times hotter than those found at the sun's surface!
127
Mars had an oxygen-rich atmosphere around 4 billion years ago
13
The population of the Earth has more than doubled since 1950.
151