Comment Re:Earthlings? (Score 2) 78
Overall I don't think there's be any reason for them to suspect that we were once here.
True but possibly because they may never make the leap now that all the easy fuel is used up. Wasn't there a story on here a few days ago about how difficult it would be to restart industry after a civilization collapse because there would be no infrastructure that can drill 10000ft underwater, etc? It took a lot more than 5M years under very different surface conditions for all that oil and coal to collect. The fact that we've burned as much fossil fuel as we did makes me think that there hasn't been a prior intelligent species (or at all?).