Massive dark matter found at the edge of the Milky Way

Triangulum II is a small, faint galaxy at the edge of the Milky Way (Source: California Institute of Technology)
Astronomers have found what may be the highest concentration of the elusive dark matter in any known galaxy, by measuring the mass of a nearby dwarf galaxy.
Although dark matter outnumber particles of regular matter by more than a factor of 10, they are elusive, researchers said.
Their existence is inferred by their gravitational influence in galaxies, but no one has ever directly ob