If two pieces of metal touch in space, they become permanently stuck together.
808
Pluto is smaller than Russia.
9
The Space Shuttle main engine weighs 1/7th as much as a train engine but delivers as much horsepower as 39 locomotives.
147
There's a mysterious dwarf planet between Mars and Jupiter called 'Ceres' which has never been visited by spacecraft or photographed in detail, however, Earth-bound telescopes reveal a large bright shining spot on the surface of this planet, the origin and nature of which are unknown.
5
The density of Saturn is so low that if you were to put it in a giant glass of water it would float.
219
Sound doesn't travel in space.
255