More than a dozen men have stood on the surface of the moon, but only three have been to Challenger Deep in the Marianas Trench, the deepest known spot in the ocean.
17
It takes a photon 170,000 years to travel from the core of the Sun to the surface, but only 8 minutes to travel the rest of the way to Earth.
6
The North Atlantic gets 2.5 centimetres (1in) wider every year.
119
The Earth sees about 760 thunderstorms every hour, scientists have calculated.
185
According to a 2011 poll, 32% of Russians believe that the Sun orbits Earth.
11
The earth is approx. 6,588,000,000,000,000,000 tons.
175
According to a study by the National Science Foundation, only half of Americans believe in evolution, and one in 4 don't know that the Earth orbits the Sun.
14