> > It hasn't anything to do with pulling the centers of planets towards
> > or away from anything. It has to do with the fact that from outside
> > a system, gravity can be calculated as a point source, but inside
> > a system you have to account for distances.
> 
> So if the Moon were a point mass Earth would not experience tides?
> Bzzt, try again.
No, but if the Earth were a point mass...

-- 
There once was a teacher of great renown,      Gather your goods        
Whose words were like the tablets of stone,    and follow me            
Because it's easier to learn than unlearn,     Or you will surely die   
Because we've passed the point of no return.   Paul Simon, 'The Teacher'

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