Astronomers Discover a Ghostly River of Stars That Could Reveal Dark Matter

A ghostly ribbon of stars winding around a faint galaxy 115 million light-years away is giving astronomers a rare new way to trace one of the universe’s most elusive ingredients: dark matter. The thin structure surrounds UGC 9050-Dw1, an ultra-diffuse galaxy about 115 million light-years from Earth. Researchers say it is the first known globular [...]