Re: Could someone explain:
			 
             
			
		
		
		
		Don't forget the storms and other features, as well.  There are 169 sectors per system, so that's a lot of room for people to create stuff. 
 
I'd be surprised if he used fixed-length records that recorded everything in an entire system.  Variable-length using lists would seem more efficient; for instance, each system could have linked lists of planets, storms, et al.  
 
Pathing could be a concern.  If every warp point is a vertex, and edges represent both intra-system travel and inter-system travel, and there are up to 10 warp points per system, 655,360 vertices (65k systems) might be a bit much.  That's especially true if there are any O(|V|^{2}) or O(|V|^{3}) algorithms in use. 
 
 
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