A newly-discovered Jupiter-like exoplanet called KELT-9b is only 2,000 degrees Fahrenheit (927 degrees Celsius, or 1,200 degrees Kelvin) cooler than our Sun. Artist’s illustration of the star KELT-9 (left) and its planet KELT-9b (right). The planet takes only 1.5 days to complete a revolution around its host star. Image credit: NASA / JPL-Caltech / Robert Hurt. KELT-9b is a gas giant 2.8 times more massive than Jupiter but only half as dense. The...
