The votes have been counted. The International Astronomical Union has declared that Pluto is no longer a planet. Science in action? Or a demonstration of why you should never trust a committee to do something, lest it come back with the job partly done, and with that part screwed up?
New Scientist last week:
Finally, astronomers could be homing in on a definition of the word planet. After a day of public bickering in Prague, followed by negotiations behind closed doors, the latest draft resolution was greeted with a broadly friendly reception.
Only they haven’t come up with a definition of the word planet.
The planet definition committee is… stepping back from trying to define all planets in the universe, and sticking to our solar system – a slightly easier task.
I agree with Mike Smith that scientific rigor requires us to have a logical rule by which we define what a planet is. But to have one that applies to only this, our sun among trillions of stars in the universe? It’s worse than having no rule at all. If your only ambition is to define the planets in our solar system, here’s how you do it: “A planet in our solar system is any of the following nine objects: Mercury, Venus, Earth, Mars, Jupiter, Saturn, Neptune, Uranus, Pluto.” Done.
Instead, they’ve come up with a rule that fails to include a body recognized as a planet for 76 years, but that fails to define which of the other… er, big things orbiting stars… are planets when we find them elsewhere. I’m not impressed. Perhaps this tells school children more about the workings of committees than it does about the workings of scientific method.
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