IIRC, we're already going dark. The amount of "noise" we broadcast into space is diminishing. If other civilizations roughly follow the progress of our own, tha

IIRC, we're already going dark. The amount of "noise" we broadcast into space is diminishing. If other civilizations roughly follow the progress of our own, that could mean that the window a civilization has to be detected is something like 100 - 200 years.