The title is misleading. The article actually describes a way to see how the Milky Way might evolve. Scientists looked for galaxies with shapes and masses similar to our own. They found that some fit the structure of our own galaxy, while others fell into two groups that were different. The Milky Way as different kinds of stars in the central bulge than the outer areas. The first group had and stars the same age throughout, while the second group had "centrally quenched" bulges with star formation in the center ceasing. The authors suspect that the Milky Way could evolve into a centrally quenched galaxy.