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Supernova AT2018cow was up to 100 times brighter than normal supernovae. The explosion left behind a source of intensive optical and ultraviolet radiation. Blue color also suggests very high temperatures.
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Astronomers led by Byeong-Cheol Lee have made a groundbreaking discovery, detecting a brown dwarf orbiting the red giant HD 18438. With a radius of 89 times that of the Sun, HD 18438 is now the largest known star to be orbited by an exoplanet or brown dwarf.