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Pluto has been demoted to dwarf planet status

DailyTech reported last week that Pluto was coming close to being dismissed as an official planet of our solar system. Pluto, which was first discovered in 1930, has been the subject of debate for astronomers for over 70 years. The International Astronomical Union's 2,500 astronomers (representing 75 countries) gathered to decide the fate of Pluto and the results are in.

The International Astronomical Union (IAU) voted to demote Pluto from the ranks of the solar system's now 8 planets.  The decision comes as Pluto no longer fits the newly ratified definition of a planet decided upon by the IAU this week. The new definition states that a planet is “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 does not clear the neighborhood around its orbit because its orbit overlaps with its much larger neighbor Neptune. This therefore disqualifies it from planet status according to the IAU. Instead, Pluto will be classified as a dwarf planet and join the ranks of other dwarf planets such as Ceres, which lies between Mars and Jupiter and 2003 UB313 or ‘Xena’ as discoverer Michael Brown of the California Institute of Technology has nicknamed it. ‘Xena’ is an icy object that lies after Pluto and is slightly larger than the now dwarf planet.



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Pluto is still a mystery
By cochy on 8/24/2006 2:29:11 PM , Rating: 2
It seems to me that even though it's not a planet now it very well may have been in the past. Maybe we'll find out when the Nasa probe gets there. I'm no astrophysicist but what if Pluto and Charon used to be one whole planet with a near circular orbit. Perhaps a large body impacted with it and destroyed this planet. Over time the pieces reformed into the Pluto-Charon system we see today. Also the force of the impact changed the orbit into the wacky one of today. Like I said there may be a simple law of physics that says this is impossible, but I dunno the thought just occured to me and seems interesting :P




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