Yeah,I got to the point mentioning the masses of the black holes before and after collision and said, &quot;What, they didn&#x27;t just <i>lose</i> three solar masses...&quot;  But, they did.<p>Which was the order of predictions I&#x27;d read, years back, but <i>egads</i>.  Considering how much larger that is than a supernova, I&#x27;d be concerned to have such an event happen in this galaxy...