sciencehabit writes: In 2005 astronomers discovered Pluto's biggest neighborhood rival: Eris, which they claimed definitely surpassed Pluto in size. Now, as astronomers report an analysis of methane gas in Pluto's atmosphere suggests that Pluto is about 2368 kilometers across, in which case it's larger than Eris and thus the champ of the Edgeworth-Kuiper belt, which boasts more than a thousand known objects revolving around the sun beyond Neptune's orbit.
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