PerspectiveAstronomy

Dark Matter in Galactic Collisional Debris

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Science  25 May 2007:
Vol. 316, Issue 5828, pp. 1132-1133
DOI: 10.1126/science.1143506

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Summary

Our ideas about galaxy formation and the nature of dark matter have been changed by the unexpected observation that galaxies that formed from the collisions of other galaxies contain dark matter.