Wandering naked or in tattered cloaks of dark matter, as many as 2000 black holes booted from their homes now live on the outskirts of the Milky Way. That's the prediction of new computer simulations, which looked at how our galaxy grew through mergers with smaller galaxies. Theory says that every galaxy may have a black hole at its centre. As galaxies merge, their central black holes merge too, building a supermassive black hole millions of times the mass of the sun.
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