Supermassive Black Hole Echoes
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High-school student accidentally discovers black hole 'light echo' twice as wide as the Milky Way

79% Informative
Astronomers call these cosmic ghosts "light echoes" The object is the afterglow of a now-dormant black hole, which once spewed radiation that ionized the surrounding gas.
Julian Shapiro , 17 , pegs the light echo at about 150,000 to 250,000 light-years in diameter.
If his estimates hold up, he thinks it could be a candidate for the largest light echo ever discovered.
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