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Comment Detectability of "broadcast signals" (Score 1) 275

Signal strength drops by the square of the distance, so if the closest possible earth-like planet with a civilization is say, 5000 light years away (about 5% of the distance across the Milky Way), is a reasonable amount of power, say 1 megawatt, 1 mile from that earth-like planet going to be detectable here on Earth after intersteller dust and gas absorption?

Would Infra-red transmission get through longer distances even better between planets?

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