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Eris, the largest known dwarf planet, was first detected in data collected in October of 2003. It was not identified until January of 2005. Mike Brown and his team of astronomers discovered what was considered to be the 10th planet while doing observations at the Palomar Observatory in California. At approximately 10 billion kilometers from the Sun, it is roughly 3 times farther out than Pluto. Eris is believed to be so far out that it is even out beyond the Kuiper Belt, which is at the outer fringe of the solar system. It takes 557 Earth years for Eris to make one orbit around the Sun. It has a highly eccentric orbit around the Sun, which causes its surface temperature to vary from -217 degrees Celsius to -243 degrees Celsius. Observations of Eris have led scientists to believe that it has frozen methane on its surface.

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