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    Anemic Galaxy reveals Deficiencies in Ultra-Diffuse Galaxy Formation theory

    February 28, 2019, Categories  Astronomy/Space

    DGSAT I (left), an ultra-diffuse galaxy (UDG), is shown next to a normal spiral galaxy (right) for comparison. Both are similar in size, but UDGs like DGSAT I have so few stars, you can see right through them, to the galaxies in the background.
    Credit: A. ROMANOWSKY/UCO/D. MARTINEZ-DELGADO/ARI

    Strange features of a newly discovered ghostly galaxy deepen mystery of how ultra-diffuse galaxies are born. A team of astronomers led by the University of California Observatories (UCO) have studied in great detail a galaxy so faint and in such pristine condition it has acted as a time capsule, sealed shortly after the dawn of our universe only to be opened by the newest technology at W. M. Keck Observatory.

    Using the Keck Cosmic Web Imager (KCWI), the team discovered a bizarre, solitary ultra-d...

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