https://www.livescience.com/space/black-holes/up-to-half-of-black-holes-that-rip-apart-stars-burp-back-up-stellar-remains-years-later
Years after ripping stars to shreds, 24 black holes suddenly flared up with radio waves in inexplicable 'burping' bouts. Half of all star-killing black holes may experience the same.
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