Deborah Harrell wrote: > > Earth-Moon was mentioned as being a double planet; is > this the accepted term, or is it still debated? I > think it makes sense, since IIRC somone calculated > that Earth's orbit would be at a different place if > there was no Moon... > I think the final word is for E-M not to be a double planet, because the barycenter [baricenter?] of the system lies inside the Earth.
[hmmm... question: _when_ will E-M become a double planet? I guess sometime in the next 10 billion years :-)] Pluto-Charon, OTOH, would be a double something, because the barycenter is outside Pluto. Alberto Monteiro _______________________________________________ http://www.mccmedia.com/mailman/listinfo/brin-l
