But the chances of any nation actually doing all that needs to be done for such a civilization to emerge remain uncertain. (religion-online.org)
It is obviously a highly uncertain exercise to attempt to estimate the number of such civilizations. (scientificamerican.com)
Perhaps being as powerful as to exist on a higher plane beyond the constraints of our physical universe would mean such a civilization already regularly «jumps» from universe to universe at will — they are no longer bound by any sort of rules that we are. (discovermagazine.com)