... Behemoth black hole found in an unlikely place . ... black holes . ... Dark matter guides growth of supermassive black holes . ... New research shows that galaxies' dark matter halos influence these mergers and the resulting growth of supermassive black holes. ... It finds that the invisible hand of dark matter somehow influences black hole growth. ... Because the dark matter outweighs everything else, it molds the newly formed elliptical galaxy and guides the growth of the central black hole. ...