Purple Earth Hypothesis

Purple Earth Hypothesis

The astrobiological hypothesis that life forms of early Earth were retinal-based rather than chlorophyll-based thus making Earth appear purple rather than green. An example of a retinal-based organism today is the photosynthetic microbe called halobacteria. [ [http://www.livescience.com/environment/070410_purple_earth.html LiveScience.com: Early Earth Was Purple, Study Suggests] Accessed May 09, 2007]

References

ee also

* red edge

External links

* [http://www.space.com/scienceastronomy/070411_nongreen_plants.html Colorful Worlds: Plants on Other Planets Might Not Be Green]


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