New planet is found on edge of solar system

"Brown and his colleagues Chad Trujillo and David Rabinowitz first photographed the planet with the 48in Samuel Oschin Telescope at the Palomar observatory, San Diego, in October 2003.

However, the object was so far away that its motion was not detected until they analysed the data again this year. It is the motion of such bodies against the background of stars that tells astronomers their position, size and movement."

Too cool.