Dancing gargantuan black holes perform on cue

Dancing gargantuan black holes perform on cue External link

Astronomers have been able to test key consequences of Einstein's theories by studying the way a couple of black holes move around each other. One of these objects is a true colossus - a hole weighing 18 billion times the mass of our Sun; the other not quite so big at "only" 150 million Sun masses.

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