So, if I understand correctly, gravity keeps us on the Earth, but this force is actually somewhere else in the universe (if we could imagine such a thing)?  I mean, yeah, it makes sense that gravity can only pull one way and putting the center of gravity at the middle of a round earth is just plain ludicrous...  I mean, if it was, then wouldn't the rest of the universe be falling in on us?  That's no way to become extinct... having the rest of the universe fall on ya.
	
		
			
		
		
	
				
			
		
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