/sci/ - Science & Math

>despite looking (and listening) for signals of other civilisations for decades, we still found nothing
i guess the most obvious reason is that we try to listen to whatever was going on there thousands of years ago? the other way around, if another civilisation is doing the same and is listening in our direction and they are like 20k lightyears away, they only would reicive silence. the only way to detect something would be when the ayyys started to transmit radio long time ago and then it's not impossible, that they are already gone by now. why is this never pointed out by the SETI community?