Astronomers Foresee Enormous Collision of Two Black Holes: “Astronomers said the merging of two similar-size galaxies into NGC 6240 was also a prelude to the future of Earth’s galaxy, the Milky Way, composed of hundreds of millions of stars, including the Sun. Many scientists believe that most galaxies, including the Milky Way, have giant black holes with the mass of millions of stars at their centers. In about four billion years, astronomers believe, the Milky Way and the nearby Andromeda galaxy will collide and merge, fusing their black holes into one.”