For the same reason that many astronomy books were changed to show that Neptune's orbit was outside Pluto's orbit for the years when it was true. To be scientific, you must accept agreed-upon definitions and be willing to accept the results of applying the definitions to the subjects of interest using the known facts.Originally posted by Over Achiever
One astronomer (i dunno who) put it best:... Since Pluto has been deemed a planet, why should we go through all the pain and change all the books, saying otherwise."
If the definition is "EITHER a body with a certain mass that was formed a certain way, OR Pluto", that's fine. My point is that you can't expect to settle it without agreeing on the definition (rules of the game) first.