Ghostly Galaxies Appear to Have Lost Their Dark Matter

Astronomers have identified galaxies that seem to have been stripped of their dark matter. According to the reporting, this dark matter was ejected during a collision between galaxies. Ironically, the missing dark matter provides some of the strongest evidence yet for the elusive substance. The finding highlights how the absence of dark matter can reveal its presence and behavior. The article frames the discovery as a notable insight into one of cosmology's central mysteries.