Milky Way's Shredded Companion Gives Dark Matter Clues

The Milky Way hasn't been kind to the Sagittarius dwarf galaxy. Located some 70,000 light-years away, the bundle of stars has been shredded and stretched into a filamentous stream by the gravity of the Milky Way. Now, scientists have mapped Sagittarius in exquisite detail, and they've used that map to provide a long-sought picture of the mysterious dark matter halo in which our Galaxy resides.

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