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The Archaeology of the Future
If we do receive a transmission from another technological civilization, it will tell us about their past. Think about the ancient greeks and shakespeare, right? They transmit information to us which is extraordinarily useful. It propagates forward in time, even though we can't ask them any questions. So by virtue of succeeding in finding a signal, we know that it's possible for us to have future because some one else has done so. In a hundred years, there's not going to be another one out there that's close enough to us ar and co temporal....