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Aug 22, 2017 at 10:27 comment added LocalFluff So SETI listens mainly on the 1-9 GHz? That's pretty busy for our current commercial applications. I suppose that's why they do it, the hardware is cheap thanks to mass production. The ETI might however communicate by sending out engraved golden record discs with the word "hello" (a word deliberately constructed by Graham Bell, btw, to make his first phone audible) repeated in different ways. Sounds extremely unlikely, but it has actually happened! So there's really no reasonable restraint on what we should expect.
Aug 22, 2017 at 8:56 comment added Rory Alsop The more the merrier :-)
Aug 22, 2017 at 8:55 vote accept SF.
Aug 22, 2017 at 8:54 comment added SF. " Rather than a large, slow solar sail, why not thousands of small sails acting in concert" - for these scales, thousands of large slow solar sails - or billions of small ones.
Aug 22, 2017 at 8:50 history answered Rory Alsop CC BY-SA 3.0