It is official: Pluto is no longer a planet. I've been following this discussion to some degree over the past week. The best alternative resolution I heard was from Michael Brown, who discovered UB313 (a larger piece of ice out past Pluto), in an NPR Science Friday podcast. He interestingly compares this whole "what is a planet" debate to what we call continents. There really is no scientifically "pure" definition of a continent. Why is Europe a continent but India not? Why is Greenland not its own continent? It is somewhat arbitrary and based on culture.
But science doesn't like arbitrary things. Brown suggests we accept the cultural definition of the 9 planets and leave it at that. The term planet means "wanderer" and ancient astronomers called them that because their paths differed from the rest of the stars. Now they have to be round and have their own paths around the Earth or something like that.
I guess the decision makes sense and stops the squabbling over whether other small objects should be planets. Now everyone can now move on. Even Pluto. Just because it is not a planet, doesn't mean it no longer orbits the Sun.
The Planet Pluto, may you rest in peace (1930-2006).
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