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Pluto doesn't make the grade


Cully

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PRAGUE, Czech Republic - Leading astronomers declared Thursday that Pluto is no longer a planet under historic new guidelines that downsize the solar system from nine planets to eight.

Much-maligned Pluto doesn't make the grade under the new rules for a planet: "a celestial body that is in orbit around the sun, has sufficient mass for its self-gravity to overcome rigid body forces so that it assumes a ... nearly round shape, and has cleared the neighborhood around its orbit."

Pluto is automatically disqualified because its oblong orbit overlaps with Neptune's.

Instead, it will be reclassified in a new category of "dwarf planets," similar to what long have been termed "minor planets." The definition also lays out a third class of lesser objects that orbit the sun — "small solar system bodies," a term that will apply to numerous asteroids, comets and other natural satellites.

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wow.

I thought just a few days ago they were gonna add a whole bunch of planets?? what happened to that?

I don't know. But my guess would be that if Pluto was to be technically considered a planet, then a bunch of other bodies would also be technically planets. So rather than opening up the 'club', they went with a more conservative definition?

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