Third Galaxy Lacking Dark Matter Discovered, Posing Challenge to Gravity Theories

Scientists have identified DF9, a third "phantom galaxy" with minimal to no dark matter, joining DF2 and DF4. These three galaxies, found in close proximity, suggest a shared origin, possibly an ancient collision that removed their dark matter. This discovery challenges alternative theories of gravity that propose modifications to explain galactic rotation without the need for dark matter, reinforcing the standard dark matter model.