Photo: Universe's "Missing" Matter May Lurk in Dwarf Galaxies

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A composite image depicts the galaxy NGC 5291 (white spot left of center) and the surrounding cloud of debris left by its collision with another galaxy 360 million years ago. New research suggests that so-called recycled dwarf galaxies around NGC 5291 (marked in pink) may contain large amounts of "missing" dark matter.

Image courtesy P-A Duc, CEA-CNRS/NRAO/AUI/NSF/NASA

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