Scanning the cosmos for signs of alien technology
Physics World
OCTOBER 20, 2021
While no definitive technosignature has been captured to date, we have picked up a few intriguing signals over the years. They do this by analysing the electromagnetic absorption spectra of an exoplanet’s atmosphere as it transits its sun, seeking the presence of gases such as oxygen, methane, water vapour and ozone (a proxy for oxygen).
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