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(Artists conception of a black hole – Photo credit: NASA/JPL-Caltech)
For the first time, three supermassive black holes have been identified in the centre of a galaxy located four billion light-years away. Locked in a tight embrace, this is the most compact trio of black holes known to date. The discovery, made by radio telescopes located in Europe, Asia and South Africa, even suggests that these closely packed systems of black holes could be more common than previously thought. Continue reading