Ultraviolet light blasting the atmosphere of giant exoplanet WASP-39b is producing a toxic gas called sulfur dioxide.WASP-39b, an exoplanet about 700 light years away, is about as massive as Saturn, but it orbits its Sun-like star on a scorchingly close four-day orbit.Its hellishly hot 1600°F atmosphere contains carbon dioxide, water, and a noxious chemical called sulfur dioxide.
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