I like that idea +1. And also if someone scanned an unocc. natural dyson and occupied it, u would know. coz the number would drop.

I dont like the idea of being able to scan for planets just to see if there is a dyson out there left. That's like saying I have never seen a Bugatti Veyron, I know they are out there. So I want a list of all the ones that are out there so I can go stare at it and know I will probably never get it. Plus it ruins the fun of scanning and not knowing what you get. Think of it like christmas every month or how ever often you scan. I do like the idea of separating planets into %s or charts so we know how many are unoccupied or a break down of the planet type IE:
Dysons: 10 (or lets say 2%)
Exotic:50000 (7%)

or what ever the actual numbers are I am just making that up for the sake of an example. That I would not mind finding and so that it is not just automatically in the game do it as a mission based award ability like you have the NPC purge where you can only view this chart lets say every 24 hours or so as a unique planet scan ability to search database or how ever it might end up working.