The Nuker Group began its work to discover why galaxies with active galactic nuclei (AGN)'that is quasars'were so bright and emitted such prodigious levels of energy and radiation. AGN galaxies would be the brightest objects within the Universe. When first detected, these folks were a mysterious, and called quasars. It was the Hubble that enabled astronomers to discern these mysterious objects were galaxies formed on the early on with the universe.
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