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Astronomers discovered a small moon in orbit of Polymele asteroid, one of the targets of the space probe Lucy. The spacecraft is set to fly through the system in 5 years.
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.