Knowledge of how the Milky Way formed and evolved is deficient. Simulations show that a past encounter with another galaxy may account for the Galaxy's intricate morphology. See Letter p.301
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R. JAY GABANY, COSMOTOGRAPHY.COM
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Struck, C. Rough times in the Galactic countryside. Nature 477, 286–287 (2011). https://doi.org/10.1038/477286a
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DOI: https://doi.org/10.1038/477286a
