"Once every 248 Earth years, Pluto swings inside the orbit of Neptune. It stays there for twenty years. During those twenty years, Pluto is closer to the Sun than Neptune. During this period of time, like the other eight planets, Pluto's atmosphere undergoes a fundamental change in character, briefly developing an atmosphere. As methane and nitrogen frozen at the poles thaw. As it moves toward its farthest point from the Sun, Pluto's atmosphere freezes and falls back to the ground" (Dejoie & Truelove 2008).
These eccentricities further suggested that Pluto was really much more "like a new group of objects found in the outer solar system," called dwarf planets and not worthy of the status of the other eight (Inman, 2008, p.2). Still, many astronomers argued in favor of a more inclusive definition that would still retain Pluto's status as a planet. In fact, one radical proposal: "would have made full-fledged planets of 50 or more additional objects" (Inman 2008, p.2). One scientist said the language of the resolution is flawed because while it requires that a planet cleared the neighborhood around its orbit." "Earth, Mars, Jupiter and Neptune all have asteroids as neighbors...It's patently clear that Earth's zone is not cleared," he said. "Jupiter has 50,000 Trojan asteroids," which orbit in lockstep with the planet (Britt 2006).
Thus, even today the definition of what is a planet is not absolute. "Owen Gingerich, historian and astronomer emeritus at Harvard who led the committee that proposed the initial definition, called the new definition 'confusing and unfortunate' and said he was 'not at all pleased' with the language about clearing the neighborhood," and called the term dwarf planet "a curious linguistic contradiction," saying "A dwarf planet is not a planet. I thought that was very awkward" (Britt 2006). The dissatisfaction over the reconfiguration of the term had political overtones as well. The IAU was criticized for being undemocratic in the way that it conducted the balloting, given that 424 astronomers were allowed to vote, out of about 10,000 professional astronomers around the globe (Inman, 2006, p.2).
The debate...
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