Ultra-hot Jupiter Definition
noun
A giant planet , of similar mass to that of Jupiter , which orbits close enough to its sun to become tidally locked , and whose day-side atmosphere has therefore heated up so much, as to break apart most molecules, leaving atomic gas. The day-side atmosphere has the temperature and spectral characteristics of a star's surface.
Wiktionary
Origin of Ultra-hot Jupiter
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ultra- + hot jupiter HOT JUPITER . From being a type of gas giant planet much hotter than most jupiter-class planets.
From Wiktionary
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