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Science 25 May 2007:
Vol. 316. no. 5828, pp. 1132 - 1133
DOI: 10.1126/science.1143506
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Perspectives

ASTRONOMY:
Dark Matter in Galactic Collisional Debris

Bruce G. Elmegreen

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.

The author is in the IBM Research Division, T. J. Watson Research Center, Yorktown Heights, NY 10598, USA. E-mail: bge{at}us.ibm.com

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Science. ISSN 0036-8075 (print), 1095-9203 (online)