Galaxy loaded with dark matter, Mauna Kea telescope suggests
By Jim Borg
July 31, 2011
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COURTESY MARLA GEHA, YALE UNIVERSITY Courtesy Marla Geha, Yale University
Using a powerful spectrograph on the Keck II telescope, astronomers identified which stars were moving together as a group, though at varying speeds. Those stars, circled in green, belong to the dwarf galaxy Segue 1.