TRAPPIST-1 c likely has an incredibly thin atmosphere, or no atmosphere at all.
. It's also possible that, at the time the exoplanet formed, there was not enough water, carbon dioxide and other volatiles available to make an atmosphere, according to the statement.
Using MIRI, the research team compared the brightness of light emitted by TRAPPIST-1 c as it moved behind its host star to when the planet was beside the star. By doing this, the team was able to calculate the amount of mid-infrared light emitted by the planet, which is directly related to its temperature and, in turn, its atmospheric composition. The emissions observed from TRAPPIST-1 c suggest a lack of carbon dioxide gas that would have otherwise absorbed the light coming from the planet.
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