Astronomy's Stacy McGaugh questions what 'ghostly' galaxies reveal about dark matter

Triplet of ‘Ghostly’ Galaxies Hints at What Dark Matter Is — and Isn’t

Quanta Magazine: Stacy McGaugh, professor of astronomy in the College of Arts and Sciences, questioned whether three galaxies lacking dark matter prove the substance physically exists. Researchers suggest an ancient collision may have separated ordinary matter from dark matter, challenging alternative gravity theories. McGaugh said the collision explanation is plausible but not definitively established.