astrophysics

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Missing galaxies? Now there’s too many

    From Quanta, Jan. 9, 2019: Fermilab scientist Alex Drlica-Wagner comments on dark matter in this article on a paradoxical problem in astronomy: New surveys have allowed astronomers to find more satellite galaxies that had previously been hidden. At the same time, updated computer simulations predicted the existence of far fewer galaxies than their predecessors did.

    The Dark Energy Camera mounted on the 4-meter Blanco telescope at the Cerro Tololo Inter-American Observatory in Chile. The final day of data-taking for the Dark Energy Survey is Jan. 9.

    Dark Energy Survey completes six-year mission

    After scanning in depth about a quarter of the southern skies for six years and cataloguing hundreds of millions of distant galaxies, the Dark Energy Survey will finish taking data on Jan. 9. DES scientists recorded data from more than 300 million distant galaxies. More than 400 scientists from over 25 institutions around the world have been involved in the project, hosted by Fermilab. The collaboration has already produced about 200 academic papers, with more to come.