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Dark Matter in the Life of Dead Galaxies

An image of the centre of the Coma Cluster. Green dots show the distribution of thousands of faint dwarf galaxies, which do not include the recent discoveries of large, ultra-diffuse galaxies. In this crowded region of space, galaxies will frequently interact gravitationally with one another and the underlying dark matter of the cluster itself. Credit: NASA/JPL-Caltech/GSFC/SDSS

An image of the centre of the Coma Cluster. Green dots show the distribution of thousands of faint dwarf galaxies, which do not include the recent discoveries of large, ultra-diffuse galaxies. In this crowded region of space, galaxies will frequently interact gravitationally with one another and the underlying dark matter of the cluster itself. Credit: NASA/JPL-Caltech/GSFC/SDSS

By Cameron Yozin

A recent discovery in the Coma Cluster highlights the important role of dark matter in transforming galaxies.

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