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Bobbywhy
#5
Mar6-12, 02:56 AM
PF Gold
P: 1,908
Here is an excerpt from NASA:

"The blend of blue and green in the center of the image reveals that a clump of dark matter resides near most of the hot gas, where very few galaxies are found. This finding confirms previous observations of a dark-matter core in the cluster. The result could present a challenge to basic theories of dark matter, which predict that galaxies should be anchored to dark matter, even during the shock of a collision."

http://www.nasa.gov/multimedia/image...ture_2189.html