Interplanet Janet is going to be busy.

There is a huge amount of buzz on the Internet today surrounding the IAU’s proposed definition of a “planet.” The definition they chose is exactly what I have for years been expecting them to select once all the dust settles. It is simple and, in my worthless opinion, appropriate.
 
“A planet is a celestial body that (a) has sufficient mass for its self-gravity to overcome rigid body forces so that it assumes a hydrostatic equilibrium (nearly round) shape, and (b) is in orbit around a star, and is neither a star nor a satellite of a planet.”
 
If this definition gets accepted by the full assembly next week, then the list of planets in our solar system will extend to include the following (and possibly others as well):
 
 1. Mercury
 2. Venus
 3. Earth
 4. Mars
 5. Ceres
 6. Jupiter
 7. Saturn
 8. Uranus
 9. Neptune
10. Pluto
11. Charon
12. 2003 UB313 (a.k.a. “Xena”)
 
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