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Scientists have fiercely debated the existence of ‘Planet 9’ for a decade. Some say evidence is piling up [outsource link building services]

Our solar system used to have nine planets. Astronomer Mike Brown, also known as “the man who killed Pluto,” said he got hate mail from kids and obscene calls at 3 a.m. for years after his most famous finding helped change that.

Brown, a professor of planetary astronomy at Caltech, discovered another small world called Eris in the Kuiper Belt — a vast ring of icy objects beyond Neptune’s orbit that also happens to be the former ninth planet’s neighborhood. The 2005 revelation set off a chain of events that led to Pluto’s still-controversial demotion from planet status the following year.

But now, just as the Kuiper Belt effectively took a ninth planet away, Brown and other scientists believe it could give one back. The belt, which astronomers believe is made of leftovers from the solar system’s formation, extends 50 times farther from the sun than Earth, with a secondary region that reaches beyond it for nearly 20 times that distance. Pluto, now classified as a dwarf planet along with Eris, is just one of the largest among the scores of icy bodies that exist there — and doesn’t dominate its own orbit and clear the orbit of other objects. That’s why it can’t have the same standing as the remaining eight planets, according to guidelines laid out by the International Astronomical Union.