Discovery of a dying supermassive black hole via a 3,000-year-long light echo

Supermassive black holes (SMBH) occupy the center of galaxies, with masses ranging from one million to 10 billion solar masses. Some SMBHs are in a bright phase called active galactic nuclei (AGN).

from Top Technology News -- ScienceDaily https://ift.tt/2T78lXY

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