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"Impossible" black hole found

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A new black hole search method has just yielded fruit, and boy is it juicy. Astronomers have found a stellar-mass black hole clocking in at around 70 times the mass of the Sun - but according to current models of stellar evolution, its size is impossible, at least in the Milky Way.

https://www.sciencealert.com/an-impossible-black-hole-has-been-found-in-the-milky-way-galaxy

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One possibility, however, could be a fallback supernova, in which material ejected from the dying star falls immediately back into it, resulting in the direct formation of a black hole. This is theoretically possible under certain conditions, but no direct evidence for it currently exists.

"Impossible" only in the headlines. 

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BHs can acquire mass by means other than 'evolution'.
We recently witnessed the merger of two stellar sized BHs to yield a larger one.
And there are examples of stellar sized BHs swallowing adjacent ( orbiting ) stars.

How would you tell the difference after the fact ?

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