[astro-ph.IM] The search for extraterrestrial intelligence (SETI) has traditionally framed the detection challenge with a focus on the parameter L in the Drake equation – the communicative lifetime of a civilisation. I argue that the more pertinent quantity is τd, the duration during which a civilisation produces technosignatures that are actually detectable by us, now. Modelling technological progress as an exponential process, we show that τd=…
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