There's a growing body of evidence that galaxies grow large by merging with other galaxies.
Astronomers would like to know the history of our own Milky Way galaxy. We all would. That's difficult to do through observations because we're embedded in it.
But astronomers have more work to do before they can draw conclusions about the Milky Way. Or about mergers and consumptions in general. A more detailed timeline of galactic evolution throughout the Universe is the goal. The dimensions are speed and chemistry. Finding the distances of all these objects will provide a third dimension, which will fill out the history of the globulars and how Andromeda consumed them.
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