Search For Earth-Like Worlds Focuses On Sun's Siblings

For systems only 100 ly away it would take at least 200 years for a reply and there is no guarantee that they are listening in the microwave or visible spectrum. They may be so advanced that radio or laser communication would be the equivalent of trying to communicate with smoke signals.

If they are that advanced, they should be able to still see "smoke signals" and recognize a pattern in the signal to realize it is not naturally occurring.

In other words, they may no longer use broadcast EM for their own communications, but that has little to nothing to do with looking for signs of life not on your own planet.

If they are looking at all, they will still see and recognize our signal. If they are attempting to be found, there is no reason not to broadcast at the lowest common denominator just

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