The Webb Telescope's first confirmed exoplanet is 99 percent the diameter of Earth
As the space agency notes, among telescopes in operation today , only the JWST possesses the resolving capabilities to accurately characterize the atmospheres of Earth-sized exoplanets. The research team is still working to determine what, if any, sort of atmosphere is sitting atop the rocky mass using by analyzing itsThere is a chance that the planet will be devoid of its critical gaseous insulation but at these distances, it could simply be hiding a very small atmo close to the surface.
They are confident that it does not possess an oppressive atmosphere similar to that of Saturn’s moon Titan, however. “There are some terrestrial-type atmospheres that we can rule out,” he said. “It can’t have a thick methane-dominated atmosphere.” That said, the surface of the planet does appear to be around 300 Celsius, several hundred degrees warmer than here on Earth. If cloud cover is discovered in subsequent studies, it could suggest a greenhouse world climate closer to Venus.
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