The Space Shuttle main engine weighs 1/7th as much as a train engine but delivers as much horsepower as 39 locomotives.
147
The population of the Earth has more than doubled since 1950.
151
In space, astronauts cannot cry properly, because there is no gravity, so the tears can't flow down their faces!
175
The sun puts out more power in 1 second than mankind has ever used within human existence.
14
Any space vehicle must move at a rate of 7 miles per second in order to escape the earth's gravitational pull.
121
The heart of an astronaut actually gets smaller when in outer space.
216
There are two golf balls sitting on the moon.
721
41% of the moon is not visible from earth at any time.
103