This is a pretty fascinating story from Dr Beatriz Villarroel, a researcher in astronomy at the Nordic Institute for Theoretical Physics (Nordita) in Stockholm who leads the Vanishing & Appearing Sources during a Century of Observations (VASCO) project.
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[ 4.9 ms ] story [ 18.4 ms ] threadShe discusses the findings in this recent YouTube video - https://youtu.be/rFQjwCgYQQo?si=Mc9dfEyCDiIuOrA-