Dark Matter, Bright Stars: New Evidence on How Galaxies Are Born

By MICHAEL D. LEMONICK Wednesday, Feb. 23, 2011

This image from the Hubble Space Telescope indicates that a huge ring of dark matter likely exists surrounding the center of CL0024+17 that has no normal matter counterpart

NASA / ESA, M.J. Jee and H. Ford et al. (Johns Hopkins University)

If you think it's hard to swallow the concept of dark matter, you're not alone. Decades ago, a few astronomers began to suspect that the universe was swarming with some mysterious, invisible substance that was yanking galaxies around with its own powerful gravity. And for those same decades, most of those astronomers' colleagues dismissed the notion as pretty much nuts./.../

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Read more: http://www.time.com/time/health/article/0,8599,2052614,00.html#ixzz1EmyQXa7L