Invisible Humanity

Invisible Humanity

On an interstellar scale, humanity is practically invisible. The radio signals that we transmit into outer space may extend over an impressive 200 light-years, but this is only a tiny fraction of the Milky Way (105,700 light-years in diameter). Even if someone were listening, after a few light-years our signals will decay into noise, impossible to identify as the source of an intelligent species.

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