The Space Shuttle main engine weighs 1/7th as much as a train engine but delivers as much horsepower as 39 locomotives.
147
Earth is the only planet in our solar system that's not named after a god or goddess.
17
The population of the Earth has more than doubled since 1950.
151
There are two golf balls sitting on the moon.
721
Saturn's rings are about 500,000 miles in circumference but only about a foot thick.
160
In space, astronauts cannot cry properly, because there is no gravity, so the tears can't flow down their faces!
175
41% of the moon is not visible from earth at any time.
103
Today's top fuel dragsters take off with more force than the space shuttle.
120