Astronomers Map Dark Matter Using First Extragalactic Stellar Stream
Astronomers have identified the first globular cluster stellar stream outside the Milky Way, located in the ultra-diffuse galaxy UGC 9050-Dw1, roughly 115 million light-years from Earth. Announced in Nature, the discovery uses archival Hubble Space Telescope data to map dark matter distribution using a new extragalactic method. For billions of years, an ancient star cluster … Read more