If two pieces of metal touch in space, they become permanently stuck together.
808
All of the Earth's continents are wider at the north than in the south - and nobody knows why.
194
Earth is the only planet in our solar system that's not named after a god or goddess.
17
Saturn's rings are about 500,000 miles in circumference but only about a foot thick.
160
There is a mysterious and loud radio signal known as 'the space roar' that has yet to be explained.
15
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
Saturn's moon, Mimas, not only looks like the Death Star, it also has a Pac Man heat signature.
15
An international team of astronomers has spotted the farthest known gravitational lens and, as Albert Einstein predicted, it is a galaxy that deflects and intensifies the light of a much further object.
9