The briefing
Deep Hubble Space Telescope imaging of the ultra-diffuse galaxy UGC 9050-Dw1 reveals evidence of a globular cluster stellar stream beyond the Milky Way. Modeling of the stream constrains the progenitor’s mass and provides the first stream-based dark matter halo estimate for such a galaxy, opening new avenues for dark matter studies.
Original headline
Evidence for the first globular cluster stellar stream beyond the Milky Way