What Happens When Two Black Holes Collide

Every galaxy has a supermassive black hole at the centre of it. The galaxy NGC 6240 within the Ophiuchus constellation, is a super galaxy that was formed as a result of two smaller galaxies colliding with one another. As a result, NGC 6240 has not one, but two supermassive black holes at its centre. Astronomers believe that one day these two black holes may very well collide with one another. So what would happen if two black holes collided?

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