For the first time, astronomers have discovered a galaxy that contains very little, if any, dark matter. Lead author: "It challenges the standard ideas of how we think galaxies work, and it shows that dark matter is real: it has its own separate existence apart from other components of galaxies."

See the source article by following the link below:
For the first time, astronomers have discovered a galaxy that contains very little, if any, dark matter. Lead author: "It challenges the standard ideas of how we think galaxies work, and it shows that dark matter is real: it has its own separate existence apart from other components of galaxies."