If you haven't yet heard (pathetic), astrophysicists at Harvard have amassed the greatest evidence to date for the existence of the ever-elusive dark matter. Much more below the fold:
Chandra Chronicle Article (Harvard newspaper)
Chandra press release
CNN
Paper from Harvard scientists
Cosmic Variance's technical analysis
Ponderings (a few months back) over whether GR will have to be replaced over large-scale distances
On the importance of good math in this discovery
Animation of the collision of galaxies that led to the discovery, with dark matter in blue and light matter in red:
Science...gotta love it.
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