It 'snows' metal on Venus.
13
Any space vehicle must move at a rate of 7 miles per second in order to escape the earth's gravitational pull.
121
A 100-pound person on Earth would weigh 38 pounds on Mars.
102
More than 20 million meteoroids enter Earth's atmosphere every day.
139
The Space Shuttle main engine weighs 1/7th as much as a train engine but delivers as much horsepower as 39 locomotives.
147
The last time that the Sun was in its current position in space around the Milky Way, dinosaurs ruled the Earth.
10
The light hitting the earth right now is 30 thousand years old.
163