The faintest star system orbiting our Milky Way may be dominated by dark matter

A bizarre system of stars that is either an ancient cluster or the most dark-matter-dominated dwarf galaxy ever found is enticing astronomers who hope it could help explain how our Milky Way galaxy formed.

Discovered to lie 30,000 light-years away by astronomers at the University of Victoria in Canada and Yale University in the United States, the system, known as Ursa Major III/Unions 1 (UMa3/U1), contains only 60 visible stars amounting to just 16 times the mass of our sun and spanning an area only 10 light-years across.


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