Chlorofluorocarbons are a potential signature of technological civilizations, say astronomers. And the next generation of observatories could spot them. JWST DiscoverMagazine
In its earliest form the Search for Extra Terrestrial Intelligence involved the hunt for messages that other civilizations were actively broadcasting for us to pick up.
The latest focus of attention is synthetic chemicals in the atmosphere. These are by-products from industrial processes that can only be produced by non-biological processes.One candidate is nitrogen dioxide, an exhaust gas produced by internal combustion engines in much greater quantities than non-human sources. So an observation of nitrogen dioxide in the atmosphere of an exoplanet is a potential technosignature .
A key part of their calculation is the James Webb Space Telescope, the most powerful instrument available to astronomers, due to start scientific operations later this year. This machine will be capable of higher resolution observations of stars like Trappist and their exoplanets than have ever been possible.
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