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Home/Science News/Discovery of a dying supermassive black hole via a 3,000-year-long light echo Science News Discovery of a dying supermassive black hole via a 3,000-year-long light echo 9th June 20210 26 Less than a minute Facebook Twitter LinkedIn Tumblr Pinterest Reddit VKontakte Odnoklassniki Pocket Read More 9th June 20210 26 Less than a minute Facebook Twitter LinkedIn Tumblr Pinterest Reddit VKontakte Odnoklassniki Pocket Show More Share Facebook Twitter LinkedIn Tumblr Pinterest Reddit VKontakte Odnoklassniki Pocket Share via Email Print