> Except that we've been pumping radio waves out of this rock as loud as we can for decades. It's true but there is a possibility that human radio activity doe

> Except that we've been pumping radio waves out of this rock as loud as we can for decades. It's true but there is a possibility that human radio activity does not last that long. We choose to transmit information using electromagnetic waves that propagates in every possible direction when there is no alternative, but it's a massive waste of energy and we may not continue to do so forever. As a matter of fact, an increasing amount of communications travel through optic fibers, which are not observable from space. (And that's also why they're efficient) If that's a correct prediction, we won't be pumping radio waves out of that rocks for more than a couple of decades. This is nothing compared to the age of the universe and may very well be missed, even if there's someone to observe.