Using X-ray data from NASA’s Chandra X-ray Observatory and optical data from ground-based telescopes, astronomers have spotted what could be the most tightly coupled pair of supermassive black holes ever seen. X-ray source LGGS J004527.30+413254.3. Image credit: NASA / CXC / University of Washington / T. Dorn-Wallenstein et al / ESA / J. Dalcanton et al / R. Gendler. Until recently, astronomers thought this source, known as LGGS J004527.30+413254.3...
