Iron, titanium found in atmosphere of hottest known planet
KELT-9b, the hottest known planet whose star-facing side reaches temperatures of over 4,000 ÂºC, has an atmosphere of vaporised iron and titanium, a study has revealed. "The temperatures are so insane that even though it is a planet it has the atmosphere of a star," said the co-author. KELT-9b was discovered last year orbiting a star 650 light-years from Earth.