Ancient quasars add to a 'major unsolved problem' in astrophysics
WASHINGTON, July 8 : A quasar — among the universe's most luminous and energetic objects — is a supermassive black hole caught in the act of guzzling matter at the heart of a galaxy. Scientists have now found quasars dating to so early in cosmic history that they are baffled as to how they already existed at tha
8 Jul 15:53 · CNA