Mistaken identity: A presumed supernova is actually something much rarer

Mistaken identity: A presumed supernova is actually something much rarer
In a case of comic mistaken identity, an international team of astronomers revealed that what they once thought was a supernova is actually periodic flaring from a galaxy where a supermassive black hole gives off bursts of energy every 114 days as it tears off chunks of an orbiting star.
phys.org
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