The temperature of the earth's interior increases by 1 degree every 60 feet down.
115
Pluto is smaller than Russia.
9
It takes eight and a half minutes for light to get from the sun to earth.
159
All of the Earth's continents are wider at the north than in the south - and nobody knows why.
194
The center of the galaxy tastes like raspberries and smells like rum, according to astronomers.
4
An organisation called Mars One is planning to establish a permanent colony of humans on Mars by 2023.
9