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
Jupiter's moon Ganymede, is larger than the planet Mercury!
149
Summer on Uranus lasts for 21 years.
358
Astronauts get taller when they are in space.
224
Some asteroids have other asteroids orbiting them.
131
The population of the Earth has more than doubled since 1950.
151
Only 55% of Americans know that the sun is a star.
986
All of the Earth's continents are wider at the north than in the south - and nobody knows why.
194