
Originally Posted by
Jaerin
There is no way for us to prevent our signals from going into space. We've been broadcasting for 50 years now.
Heck the light of our cities would probably be potentially perceptible a significant distance away.
Imagine tomorrow we got a signal from another galaxy that was some how readable and understandable from our perspective. Even if we discovered it tomorrow we couldn't communicate with them because of the 10-25 year+ delay, we can't go see them because of the light-years of distance from us, and we certainly wouldn't be affected by them other than psychologically.
The only difference between that signal and the light from a star is that we see a different pattern in it.