Astrologists have long contended that the stars profoundly influence people here on Earth. And it looks like they may have stumbled onto the truth - at least when it comes to one star: the sun. Because a new analysis of Norwegian birth records suggests that children born during periods of high solar activity lived five years less, on average, than did their counterparts born during periods of low solar activity. And women born during solar maxima appear to have been less fertile. Those findings appear in the Proceedings of the Royal Society B. Researchers analyzed more than 8,600 births from 1676 to 1878, while controlling for other factors like socioeconomic class. And indeed, higher solar activity at birth appeared to cut life span. The reason, the researchers say, could be exposure to increased ultraviolet radiation during periods of high solar activity. Because that UV light can degrade an expectant mothers' stores of folate, a B vitamin essential to a baby's healthy development. It's unclear whether the effect would still hold today, as many pregnant women - take supplements of the vitamin.