Webb Telescope's just found its first exoplanet - but there's a hellish catch

Earth has a rocky twin orbiting a dim red star 41 light years away - but it may turn out to be a hot hellworld more like Venus.Exoplanet LH 475b has a radius about 99 percent the size of Earth's, but that rocky radius is surrounded by either a choking atmosphere of carbon dioxide - or the vacuum of space, according to recent observations with the James Webb Space Telescope (JWST).

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