|This artist's concept shows the planet catalogued as 2003UB313 at the lonely outer
fringes of our solar system. Our Sun can be seen in the distance. The new planet,
which is yet to be formally named, is at least as big as Pluto and about three times
farther away from the Sun than Pluto. It is very cold and dark. The planet was
discovered by the Samuel Oschin Telescope at the Palomar Observatory near San Diego,
Calif., on Jan. 8, 2005.
Image credit: NASA/JPL-Caltech