Andromeda Milky Way Collision . This simulation shows what will happen when the Milky Way and Andromeda get closer together and then collide, and then finally come together once more to merge into an even bigger galaxy. Dr Kafle said the research suggests scientists previously overestimated the amount of dark matter in the Andromeda galaxy. Following that, another galaxy-altering merger will occur, when the neighboring Andromeda galaxy (currently 2.5 million light-years away) … In 2012, researchers determined that a collision between the Milky Way and the Andromeda Galaxy was sure to happen, based on Hubble data that tracked the motions of Andromeda from 2002 to 2010. Andromeda, the Milky Way's nearest, and much bigger, neighbouring galaxy is headed towards us. Andromeda and the Milky Way are heading on a collision course that will alter the structure of the two galaxies forever. Such collisions are relatively common, considering galaxies long lifespans. The Andromeda galaxy is our largest and closest neighbor in the universe. Researchers concluded the galaxies would collide, using Hubble to track the motions of stars in Andromeda with unprecedented accuracy. These waves became Andromeda's spiral arms. But, galaxy collisions are common in the universe. Astronomers predict that in about four billion years, the Andromeda galaxy will collide with our own galaxy… But don't worry about a collision during your lifetime. But on the scale of galaxies, they are quite close together. Until 2012, it was not known whether the collision was definitely going to happen or not. Right now, the Milky Way and Andromeda are so far apart that even light takes two million years to journey between them. But when the galaxies are similar in size and mass – like the Milky Way and Andromeda – the close encounter destroys the spiral arm structure. Before being hit, Andromeda is thought to have been a disk galaxy — one with no arms. 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