ANALOGY. “Wright et al. (2014) noted that his assumption fails for the only technological species we have an example of: humanity. The ratio of the timescales for humans to cross the Earth to the age of the technology that enables such travel is small: today for aircraft, it is roughly 10(-4 ) days over decades, but even a thousand years ago it was under 10(-3) years over millennia. Despite this, most spots on Earth show no obvious signs of humans or our technology. “
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