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- Astronomers find heaviest black hole pair in the universe, and they've been trapped in an endless duel for 3 billion years | Live Science https://www.livescience.com/space/black-holes/astronomers-find-heaviest-black-hole-pair-in-the-universe-and-theyve-been-trapped-in-an-endless-duel-for-3-billion-years 0 comments
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