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TRAPPIST-1 b lacked atmosphere. TRAPPIST-1 c? Much the same. Though thought to be similar to Venus (both in size and amounts of radiation from its star), Webb found it lacks Venus’s thick CO2-rich atmosphere. If there is one, it’s very thin. https://go.nasa.gov/3NBm7vJ
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Webb Rules Out Thick Carbon Dioxide Atmosphere for Rocky Exoplanet

Infrared measurements of TRAPPIST-1 c indicate that it is probably not as Venus-like as once imagined.
Madison Olson (NASA)
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