Two landmark papers in the 1970s contributed strongly to establishing the importance of galaxy interactions and mergers in the formation and evolution of galaxies, using only gravity, and the ensuing dynamical friction.
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Athanassoula, E., Bosma, A. Interacting galaxies and mergers. Nat Astron 3, 588–589 (2019). https://doi.org/10.1038/s41550-019-0822-z
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DOI: https://doi.org/10.1038/s41550-019-0822-z
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