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RE: Greetings OAs - stevebowers - 02-15-2021
Geoff Landis' Percolation Theory paper is interesting in this regard, too.
http://www.geoffreylandis.com/percolation.htp
![[Image: perc.gif]](http://www.geoffreylandis.com/perc.gif)
It means a galactic civilisation might fail to colonise, or even visit, a fraction of alll the worlds in a galaxy, so colonisation need not be complete.