November 15, 2012

Dark Matter vs. Modified Newtonian Dynamics

Chris Lee, Ars Technica


AP Photo

Way back in the olden days, when the world was young and we were all much more innocent, the Bullet Cluster was discovered. It was a revelation: two galaxy clusters had collided, leaving a mess of glowing ordinary matter and large clumps of invisible, gravity-rich material—in completely separate locations. Combined with some modeling, this was hailed as an unambiguous observation of dark matter.

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TAGGED: Dark Matter, Modified Newtonian Dynamics