Jupiter's moon Ganymede, is larger than the planet Mercury!
149
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
A lightning bolt generates temperatures five times hotter than those found at the sun's surface!
127
Jupiter is bigger than all the other planets combined.
254
There is a mysterious and loud radio signal known as 'the space roar' that has yet to be explained.
15
All of the Earth's continents are wider at the north than in the south - and nobody knows why.
194