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It wouldsimply reflect astronomers' increasing understanding of the solar system. Given Pluto's complex geology, Stern and some other members of the astronomical community began arguing that Pluto should be designated as a planet …
"The vote at the IAU is about an agreement on how you name things, and that was an important difference.
But it was a lucky find nonetheless. A friendly debate about Pluto's planethood yesterday (April 29) ended in an informal vote that came down in favor of reinstating the dwarf planet's status.Early in the morning Eastern time, after a livestreamed Philosophical Society of Washington discussion earlier that evening, Alan Stern — principal investigator of the New Horizons mission that flew by Pluto — But since 2006, the International Astronomical Union, represented in the debate by former IAU president Ron Ekers, has used another definition for planethood, which excludes Pluto.
The committee asked that their discussions not be made public, which Ekers acknowledged may have been a mistake, but he added that media were invited (and present) at the decision that made Pluto a dwarf planet.The vote took place at the August 2006 IAU meeting in Prague, which included 424 voting members (out of a total membership of 9,000). Eris wasthought to be bigger than Pluto until Nov. 6, when astronomers got a chance to The new finding brings renewed attention toPluto, and to the controversial decision to strip the frigid world of itsplanet status. "We are going to learn so muchmore about the solar system with our new understanding of what Pluto is. "There are a large number of planets,and most of them are small," Stern said.
It's more revealing to groupobjects that are similar in size, composition and other properties. Its discovery in 2005 ultimately led astronomers — uncomfortablewith the prospect of finding many more planets in the frigid outer reaches ofthe solar system — to reconsider Pluto's status.In 2006, the International Astronomical Unioncame up with the following official definition of "planet:" A bodythat circles the sun without being some other object's satellite, is largeenough to be rounded by its own gravity (but not so big that it begins toundergo nuclear fusion, like a star) and has "cleared itsneighborhood" of most other orbiting bodies.Since Pluto shares orbital space with lots ofother objects out in the Kuiper Belt — the ringof icy bodies beyond Neptune — it Dwarf planets are not officially full-fledgedplanets, so Pluto was stripped of the status it had held since its discovery in1930. He brought up the matter of expertise in the IAU planet definition committee, arguing it should have been made up of planetary scientists: "If, God forbid, somebody here was diagnosed with a neurological problem, I would hope you would go to a neurologist and not a podiatrist, or some other form of doctor, because expertise does matter. "It has an atmosphere made of the same stuff we are breathing," he argued. "I think that Pluto as an example of alarge Kuiper Belt object is so much more interestingthan Pluto as this very weird planet at the outer edge of the solar systemunlike anything else," Brown said. If Earth circled the sun inUranus' orbit, it wouldn't be able to clean out its neighborhood and would thusnot qualify as a planet, Stern said.In Stern's view, a planet is anything thatmeets the IAU definition's first two criteria — the bits about orbitingthe sun and having enough mass to be roughly spherical, without the"clearing your neighborhood" requirement.So Pluto should be a planet, as should Erisand the Such a definition would greatly expand thelist of planets in the solar system.Many astronomers were uncomfortable with thisprospect, according to Stern, and that discomfort was a big factor in thedecision to demote Pluto. So Pluto should be a planet, as should Erisand the dwarfplanet Ceres(the largest body in the asteroid belt between Mars and Jupiter), as well asmany other objects. New York,
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