Staff Pick: How I Killed Pluto and Why It Had It Coming

How I Killed Pluto and Why It Had It Coming
By Mike Brown

In 2005, Brown discovered a tenth planet, dubbed Eris, that was 27 percent more massive than Pluto. The resulting controversy in the scientific community led to the eventual demotion of both as planets. Do folks care? You bet; there's even a Facebook group "When I was your age, Pluto was a planet," with almost two million members. Brown has the inside track here; he was even proclaimed one of Time's "100 Most Influential People" in 2006 for his part in this brouhaha.
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