Astronomers Discover First Quadruple Quasar

Astronomers using two 10-m optical/infrared telescopes at the W. M. Keck Observatory have discovered the first quadruple quasar, catalogued as SDSS J0841+3921. The quartet – four active black holes situated in close proximity to one another – resides in one of the most massive structures ever discovered in the distant Universe. It is surrounded by [...] —> Read More