The heart of an astronaut actually gets smaller when in outer space.
216
The Space Shuttle main engine weighs 1/7th as much as a train engine but delivers as much horsepower as 39 locomotives.
147
Tidal forces between the Earth and Moon are slowing the Earth down and pushing the Moon further away.
46
The earth rotates more slowly on its axis in March than in September.
145
Some asteroids have other asteroids orbiting them.
131
The density of Saturn is so low that if you were to put it in a giant glass of water it would float.
219
Jupiter's moon Ganymede, is larger than the planet Mercury!
149
Saturn's moon, Mimas, not only looks like the Death Star, it also has a Pac Man heat signature.
15