Chandra X-ray Observatory data for J0045+41 (inset, blue region) in the context of optical images of Andromeda from the Hubble Space Telescope. (NASA/CXC/University of Washington/ESA)
It seems like even black holes can’t resist the temptation to insert themselves unannounced into photographs. A cosmic photobomb found as a background object in images of the nearby Andromeda galaxy has revealed what could be the most tightly coupled pair of supermassive black holes ever seen.