/sci/ - Science & Math

>>16080399
Anon this is how much glass erodes in the ocean over just about 100 years. Now imagine what it'll look like in 10,000 years, maybe just a little bit of discolored sand. Human build shit doesn't last very long on Earth timescales. With that being said it's not impossible to tell if sentient lifeforms existed in the very distant past, you just have to look at radioisotope signatures which indicate a civilization has become advanced enough for nuclear fission/fossil fuel burning. An advanced species wouldn't know the exact extent of human intellectual capabilities, so advanced mathematics and physics, but they could get a pretty good idea. Also no, there is no indication that advanced species existed in the past.