The Earth gets heavier each day by tons, as meteoric dust settles on it.
118
Mars had an oxygen-rich atmosphere around 4 billion years ago
13
Saturn's rings are about 500,000 miles in circumference but only about a foot thick.
160
An organisation called Mars One is planning to establish a permanent colony of humans on Mars by 2023.
9
There are approximately 3,500 astronomers in the U.S. - but over 15,000 astrologers.
124
The Space Shuttle main engine weighs 1/7th as much as a train engine but delivers as much horsepower as 39 locomotives.
147
It 'snows' metal on Venus.
13
A comet's tail always points away from the sun.
2