Patrick.net

http://www.time.com/time/health/article/0,8599,2119406,00.html?hpt=hp_t2

For the first time, scientists have found proof that some galaxies are, gulp, entirely starless — virtually invisible cosmic islands composed of gas and dark matter but nothing else. A galaxy without stars seems a little like a cloud without water vapor — lacking the very thing that is supposed to define it in the first place. But a group of scientists have recently discovered at least a dozen such cosmic oxymorons, and in a paper just published in Monthly Notices of the Royal Astronomical Society argue that dark galaxies may actually represent a critical stage in galactic evolution, making some of the biggest, brightest galaxies possible.

It's the one's you don't see that gets you...