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A collision observed between two black holes, each more massive than a hundred suns, is the largest merger of its kind ever ...
“Third, as an unexpected bonus, it turns out that both galaxy nuclei also have an active supermassive black hole. So, this ...
"The biggest surprise of all was that the black hole was not located inside either of the two nuclei but in the middle. We asked ourselves: How can we make sense of this?" ...