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What exactly are blazars and quasars? How are they different?
Quasar - Wikipedia
The Hubble telescope found the brightest quasar ever and also needs a fix
Hubble Telescope Finds Double Quasar in Early Universe - Mellon College of Science - Carnegie Mellon University
ESA - Hubble captures a 'quintuple' quasar
Are quasars star-making machines? – Physics World
International team observes innermost structure of quasar jet, MIT News
Astronomers spotted a long jet shooting out of a quasar 7.5 billion light-years away
File:Black hole quasar NASA.jpg - Wikimedia Commons
NASA's Webb Will Use Quasars to Unlock the Secrets of the Early Universe - NASA