Summer on Uranus lasts for 21 years.
358
It 'snows' metal on Venus.
13
There are more nerve cells in the human brain than there are stars in the Milky Way.
349
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
Pluto is smaller than Russia.
9
Mars had an oxygen-rich atmosphere around 4 billion years ago
13