Scientists astonishing hypothesis: the earth was purple.

World Scientific reports [tech.] News: this year the annual meeting of the American Astronomical Society, scientists presented the "purple Earth" hypothesis. .A U.S. study has announced that the earliest life on Earth may be purple, just like the same as the plant is green. .They believe that the ancient microbes may not use chlorophyll to absorb the sun's rays, but with another molecule, giving a violet hue of these biological molecules. .<P> Chlorophyll is used for modern plant pigments in photosynthesis. .They can absorb light in the blue and red light, and reflects green light. .It is this reflected light defines the color of the leaves of plants. .However, for some biologists bewildered. .Because the green light in the visible light wave contains most of the energy. .Correction in the evolution, the human eye has become the most sensitive to green light (which is why night vision goggles in the cause of the image is green.) .Why so photosynthesis is not right to adjust it? .</ P> <P> the University of Maryland microbial geneticist Marshall Da Sama that when chlorophyll appears, already exists on the early Earth was another light-sensitive molecule called retinal that it (retinal). .Today, retinal present in photosynthetic bacteria called micro-organisms in salt. .It's the purple membrane absorption of green light, reflecting red and violet light. .Combined they formed a purple. .</ P> <P> Dasa Ma said that this used retinal to absorb the sun's original micro-organisms, may dominate the early Earth. .In this way, the Earth's biological hotspots on the earliest to be dyed a unique purple. .</ P> <P> As latecomers, microbes can not chlorophyll and retinal micro-organisms in direct competition. .But they evolved another capacity - not required retinal absorption of light waves, which survived. .The astronomers involved in the study, William Sparks, said: "Chlorophyll is the idea of forced choice but to use blue and red light, green light as all those who have been absorbed by the purple biology." </ .P> <P> according to the researchers speculate that chlorophyll of plants and plant had retinal coexist for a time. ."You can imagine circumstances at the time, a layer of purple creature is also engaged in the following alternative photosynthesis." Dasa Ma said. .But soon, this balance began to favor chlorophyll plants, because plants than retinal efficient. .In this regard, Sparks explained: "Although the sun did not learn of chlorophyll the best light, but it is better use of its absorption of light." </ P>.