41% of the moon is not visible from earth at any time.
103
Some asteroids have other asteroids orbiting them.
131
The Space Shuttle main engine weighs 1/7th as much as a train engine but delivers as much horsepower as 39 locomotives.
147
Astronauts get taller when they are in space.
224
In the last 7 years, humanity has discovered 43 potentially habitable planets.
14
All of the Earth's continents are wider at the north than in the south - and nobody knows why.
194
The density of Saturn is so low that if you were to put it in a giant glass of water it would float.
219