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'Purple Earth' Hypothesis

While today's Earth is dominated by the color green from plants, an earlier stage of the planet had a purple cast to it, a researcher has theorized. Primitive microbes that used retinal to harness the sun's energy, instead of chlorophyll, would have had a violet hue. For more on the study, visit LiveScience(1).

1. http://www.livescience.com/environment/070410_purple_earth.html

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