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How do astronomers know what Eris is made of?

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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. ... It takes 557 Earth years for Eris to make one orbit around the Sun. It has a highly eccentric orbit ... Eris has one moon that we currently know about. read more

Observation of the Albedo many places on the dwarf planet aswell as the frequency of light being reflected off the dwarf planets surface. read more

The discovery of Eris was so important because it was a celestial body larger than Pluto, which forced astronomers to consider, for the first time in history, what the definition of a planet truly is. read more

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