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Messaging with Cost-Optimized Interstellar Beacons
2 How would we on Earth would build galactic-scale Beacons to attract the attention of extraterrestrials, as some have suggested we should do? From the point of view of expense to a builder on Earth, experience shows an optimum tradeoff. This emerges by minimizing the cost of producing a desired power density at long range, which determines the maximum range of detectability of a transmitted signal. We derive general relations for cost-optimal aperture and power. For linear dependence ofdoi:10.1089/ast.2009.0393 pmid:20624056 fatcat:us3jrurblzhkrgiukh4rjnqa4m