It's still a sore subject for many people: OnThisDay in 2006, Pluto was demoted from its status as a Planet. PlutoDemoted
Even though Pluto was officially downgraded from planetary status over a decade ago, fans of the solar system's underdog are still rooting for the small cosmic body. Case in point: NASA Administrator Jim Bridenstine, who stepped into the long-standing debate over Pluto's planethood during press remarks on Friday .
See moreThat verdict goes against the official decision made by the International Astronomical Union back in 2006, which resulted from a vote among astronomers. Pluto was discovered by American astronomer Clyde Tombaugh in 1930. Some researchers began calling Pluto's planethood into question in the late 1990s, after it became clear that Pluto was far from alone in the Kuiper Belt, the ring of icy bodies beyond Neptune's orbit.
Instead, the IAU determined, Pluto and similar bodies should be classified as dwarf planets. Planethood requires that an object orbit the sun, have a nearly round shape, and"clear its orbital neighborhood," according to the IAU, and the astronomers who voted in the 2006 decision weren't convinced Pluto met that last criterion.
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