![]() ![]() ![]() We don't have a population of thousands of trillions. Why do you assume the cost of settling other stars would become negligible? This is getting close to imagining a perfectly spherical cow in a frictionless environment. SETI never had a chance to find anything. They simply chatter locally using radio waves, in many cases, their antennas are pointing towards their intended receivers, and not randomly towards some exoplanet far far away (the Earth). If our friends are 10 times farther away from us than Proxima Centauri, then we need to overcome another factor of 100.īut, our friends out there don't know about us, and they don't set up a mighty large antenna and align it perfectly in our direction. Somehow between their bigger antenna and our bigger antenna, we need to overcome the 4 million decay factor. We should also point a bigger antenna at them (the one we point at Voyager is 70 meter wide, not really a toy). So, our friends out there need a much bigger antenna than the one on the Voyager, and we need them to point it straight at us, and we need them to blast a mighty strong radio signal towards us. Radio waves decay with the square of the distance, so if a Voyager-size antenna were to transmit towards us from 2000 times farther away, we'd get a signal 4 million times weaker. The closest star is about 2000 times farther than Voyager 1. At the rate of 7.2 kb/s, or one quarter of the bandwidth of the old dialup connections. That's what we are doing with Voyager right now, we point some high-gain antennas at each other and talk. We point a big parabolic antenna at each other and start exchanging radio massages. Let's say there is a civilization out there, and we know about each other and want to talk. ![]()
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