Sound doesn't travel in space.
255
The moon is actually moving away from Earth at a rate of 1.5 inches per year.
236
In the last 7 years, humanity has discovered 43 potentially habitable planets.
14
The Space Shuttle main engine weighs 1/7th as much as a train engine but delivers as much horsepower as 39 locomotives.
147
Saturn's rings are about 500,000 miles in circumference but only about a foot thick.
160
Lightning strikes about 6,000 times per minute on this planet!
158
Summer on Uranus lasts for 21 years.
358
The heart of an astronaut actually gets smaller when in outer space.
216