RE: Scientists: 100 million worlds may have complex alien life in our galaxy
June 11, 2014 at 11:48 pm
(This post was last modified: June 11, 2014 at 11:50 pm by Thumpalumpacus.)
70 per cent of the current universal history had passed before Earth even formed. While the incidence of life was probably less in the youth of the Universe (due to excessive radiation, heavier elements not having formed via supernovæ, etc) it seems to me that the intervening eons would exert a leveling effect, because on the whole, bad things are as likely as good, in evolutionary terms.