Yahoo!: Even small changes in solar activity can impact Earth's climate in significant and surprisingly complex ways, researchers say.
The sun is a constant star when compared with many others in the galaxy. Some stars pulsate dramatically, varying wildly in size and brightness and even exploding. In comparison, the sun varies in the amount of light it emits by only 0.1 percent over the course of a relatively stable 11-year-long pattern known as the solar cycle.
Still, "the light reaching the top of...