The lights in the universe are going out. Now astronomers think they know why.

The universe just isn't what it used to be. Billions of years ago, when the universe was still in its infancy, the casual observer would have seen stars forming all around him, and at a pretty rapid clip. In recent years, however (i.e. the last few billion), the rate of star formation has slowed to a fraction of its… »8/23/11 3:00pm8/23/11 3:00pm