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New research from the University of Western Australia node of the International Center for Radio Astronomy Research (ICRAR) suggests that large "monster" galaxies eventually stop producing stars for growth, but instead, dine on their smaller nearby galaxy neighbors.
The seven-year-long research project looked at over 20,000 galaxies before making this determination. Over 90 scientists participated. Their observations showed that smaller galaxies grew by creating stars from gas, an easy process for them. However, once galaxies become larger, it's harder to produce stars this way, so the only way they can grow is by merging and absorbing other galaxies.
In a simulation, scientists show how the collision between the Milky Way and Andromeda will happen, including the merging of the two into one massive galaxy.
It would be extremely difficult to model precisely what would occur with the stars themselves, and I am quite certain that there will be star collisions. Our star might not survive, but I'm not too worried about it seeing as how I won't be here when that goes down.