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MISH MASH: Pluto no longer a Planet, Charon; No Upgrade in Status

Thursday, August 24, 2006

Pluto no longer a Planet, Charon; No Upgrade in Status

So the decision was handed down by the IAU committee today. Pluto was demoted. It's no longer a planet. Charon, which is Pluto's moon did not get a promotion either. Here is my previous post on this topic. There were speculations that it would be upgraded to the status of a planet. The word "planet" received a brand new definition:
"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'nt qualify. The decision establishes three main categories of objects in our solar system.
Planets: Mercury to Neptune. Total of 8 planets
Dwarf Planets: Pluto and any other round object that "has not cleared the neighborhood around its orbit, and is not a satellite." These are not real planets
Small Solar System Bodies: All other objects orbiting the Sun.
Two of the objects that were being considered to be called planets are now in the same category as Pluto (dwarfs): the asteroid Ceres, which was a planet in the 1800s before it got demoted, and 2003 UB313, an icy object slightly larger than Pluto aslo nicknamed as "Xena."
Pluto Facts:
* Named after underworld god
* Average of 5.9bn km to Sun
* Orbits Sun every 248 years
* Diameter of 2,360km
* Has at least three moons
* Rotates every 6.8 days
* Gravity about 6% of Earth's
* Surface temperature -233C
* Nasa probe visits in 2015

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