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
If you were to cry in space, the tears would form a bubble in your eye until it's so big it moves to another spot on your face.
10
In space, astronauts cannot cry properly, because there is no gravity, so the tears can't flow down their faces!
175
All of the Earth's continents are wider at the north than in the south - and nobody knows why.
194
Lightning strikes about 6,000 times per minute on this planet!
158
The last time that the Sun was in its current position in space around the Milky Way, dinosaurs ruled the Earth.
10
An unprotected human can survive up to 1.5 minutes in space with no permanent bodily damage.
82