In the scorching atmosphere of exoplanet KELT-9b, even molecules are torn to shreds. Massive gas giants called “hot Jupiters”—planets that orbit too close to their stars to sustain life—are some of the strangest worlds found beyond our solar system. New observations show that the hottest of them all is stranger still, prone to planetwide meltdowns so severe they tear apart the molecules that make up its atmosphere.
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