594078 external_news 1501868863 1501869995 Somewhere in Artist Heaven, the man who gave us "Purple Rain" is smiling. The Purple Earth hypothesis suggests that the single-celled organisms that ruled the planet during its early years may have lent Earth a purple tinge if seen from space. Researchers are now wondering if the theory could help determine the potential for life on recently discovered exoplanets. Jennifer Glass, assistant professor in the School of Earth and Atmospheric Sciences, and Frank Stewart, associate professor in the School of Biological Sciences, react to the hypothesis in this latest installment of CNN's Colorscope series. 

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