My view is that the signal is constantly emitted, so GC is in our past light cone, but it may be very remote so we still are not able to detect the signal. But if they control a large part of the visible part of the sky, they will be able to create something visible—so they either don’t want or not exist.
My view is that the signal is constantly emitted, so GC is in our past light cone, but it may be very remote so we still are not able to detect the signal. But if they control a large part of the visible part of the sky, they will be able to create something visible—so they either don’t want or not exist.