Black holes may be colliding at spiral galaxies' rims: Study
A US-based study led by Indian origin researcher Sukanya Chakrabarti suggests that edges of spiral galaxies like the Milky Way have favourable conditions for black hole mergers. The metal content around the edges is known to be low and should be rife with black holes, Chakrabarti said. The edges would serve as prime locations for detecting sources of gravitational waves.