In space, astronauts cannot cry properly, because there is no gravity, so the tears can't flow down their faces!
175
Earth is the only planet in our solar system that's not named after a god or goddess.
17
A neutron star (what remains after a Super Nova) is so dense that a portion of it the size of a sugar cube would weigh as much as all of humanity, or more than all the cars in the United States.
5
The density of Saturn is so low that if you were to put it in a giant glass of water it would float.
219
Saturn's rings are about 500,000 miles in circumference but only about a foot thick.
160
The temperature of the earth's interior increases by 1 degree every 60 feet down.
115
The Space Shuttle main engine weighs 1/7th as much as a train engine but delivers as much horsepower as 39 locomotives.
147
Neil Armstrong, the first man to step foot on the moon, carried with him a piece of cloth and wood from the original 1903 Wright Flyer.
12