Even more probable is the evolution to spread spectrum techniques. Look at what has happened to a lot of our emissions - they have moved to spread spectrum. This would no longer be detectable as an emission type that is detectable by SETI technology. We may migrate largely to a communications technology undetectable by SETI measurements less than 100 years after we started using radio. That is another window that has nothing to do with extinction of our species.
There is a more far fetched possibility - that of communications via gravitational waves. There have been a number of papers talking about the conversion of EM waves into gravitational waves in certain types of superconductors. If that ever proves to be possible, it would open a whole new spectrum - one that could harbor SETI communications. On Thu, Jan 5, 2017 at 6:38 PM, <[email protected]> wrote: > In reply to Jones Beene's message of Thu, 5 Jan 2017 08:16:05 -0800: > Hi, > [snip] > >... estimate that there should be many advanced civilizations in the > >Universe, a few of whom are close enough that we should be able to > >communicate with them or at least catch glimpses of their broadcast > >signals. Except ... that is, for the last term in the Drake equation ( L > >= The length of time such civilizations release detectable signals into > >space). This is the troubling part. Maybe advancing science invariable > >hits a plateau where it always... or almost always ... self-destructs. > >Maybe every civilization that discovers LENR succumbs to the dark side. > > There is another possibility, i.e. that the reason for the short window is > not > self destruction, but rather that they discover FTL communication > techniques, > and stop broadcasting using EMF. > > Regards, > > Robin van Spaandonk > > http://rvanspaa.freehostia.com/project.html > >
