Weighing the Milky Way: Researchers devise precise method for calculating the mass of galaxies
Using a new, more accurate method for measuring the mass of galaxies that includes collecting information about the distances between the Milky Way, Andromeda and other close-by galaxies, an international group of researchers has shown that the Milky Way has half the Mass of the Andromeda Galaxy.
By studying both the galaxies in and immediately outside the Local Group, Walker was able to pinpoint the group’s center. The researchers then calculated the mass of both the ordinary, visible matter and the invisible dark matter throughout both galaxies based on each galaxy’s present location within the Local Group. Andromeda had twice as much mass as the Milky Way, and in both galaxies 90 percent of the mass was made up of dark matter.