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Loading contentA sign not of life but of technology — a radio or optical signal, an artificial light, an industrial pollutant, or a megastructure. The search for technosignatures is the search for intelligence, led by SETI and Breakthrough Listen.
Facts on this topic will be cited from these primary and reference sources.
Mission data, planetary science, space telescopes, and public-domain imagery.
Most NASA-produced imagery is in the public domain; individual items are checked for usage terms before publication.