Artist conception of the KELT-9 system. The host star is a hot, rapidly rotating A-type star that is about 2.5 times more massive and almost twice as hot as our sun. The hot star blasts its nearby planet KELT-9b, which transits in front of the star once only 36 hours, with massive amounts of ultraviolet and optical radiation, leading to a dayside temperature of the tidally-locked planet of 7800 degrees Fahrenheit, hotter that most stars and only 2000 degrees cooler than the sun.
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