Astronomers Witness Light Delayed by Almost 7 Years as It's Warped by a Galaxy Cluster
Way back in 1979, astronomers spotted two nearly identical quasars that seemed close to each other in the sky. These so-called 'Twin Quasars' are actually separate images of the same object.
United States Tel Aviv Fred Lawrence Whipple E Ofek Caltech Department Of Astronomy Astronomical Observatory Of The University Valencia
Source: sciencealert.com