Originally Posted by
PyroTime
Hurrdurr the moon wouldn't be any different if it was hollow from the begining. So all you idiots saying "OH WE WOULD KNOW IF IT WAS HOLLOW CUS ITD BE DIFFERENT FROM WHAT IT WAS HURRDURR" if it was always hollow wtf is going to be different?
Do you even have the slightest clue how masses of moons/planets are determined? If you don't I suggest you look into that, this doesn't make you look a lot smarter.
http://www.mathpages.com/home/kmath469.htm
Maybe this helps. If the moon would have a different mass, the distance or its angular velocity would be bigger. It doesn't matter at all how long it has been this way, just the mass and with that the distance or the angular velocity would be different. And if you see a pretty huge moon with a very small mass, it gets obvious somethings off.
Also, don't start with the "the shell would be dense". If it would be dense, the angular momentum would be way off.