Apparently, black holes that eat stars have a habit of burping up bits of them years later. In at least 50% of cases, black holes produce radio emissions several years after eating a star.
This shouldn't be possible, but it is. Presumably it's coming from the accretion disk not the hole itself, but black holes getting indigestion is a phenomenon to send your starship to...especially as you would know it was going to happen in advance.
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