These were not expected. Of course, in many, maybe in most cases, when something unexpected is seen, theorists can come up with explanations. And so my personal, the option that I think is most likely to turn out to be true is that you begin with smaller black holes that form inside what we call globular clusters or big clusters of stars. They sink to the bottom through gravitational interactions with the smaller stars with less massive stars. They find each other and merge. That merged hole merges with another merged hole. And you build up fairly quickly to two 30 solar mass black holes.

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