Purple Earth hypothesis
Purple Earth hypothesis
Astrobiological hypothesis regarding early photosynthetic organisms.
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First pulled by hambulo, Nov 2, 2026
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Readers' pathsAug 2026 – Oct 2026
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Retinal
Vitamin A aldehyde, a polyene chromophore.
15%
Haloarchaea
Class of salt-tolerant archaea.
10%
Canfield ocean
Hypothetical middle to late Proterozoic ocean composition.
9.2%
Great Oxidation Event
Paleoproterozoic surge in atmospheric oxygen.
8.2%
San Francisco Bay Salt Ponds
Salt evaporation ponds in the San Francisco Bay, California.
5.2%
Archean
Geologic eon, 4031–2500 million years ago.
4.6%
Huronian glaciation
Severe glaciation during the Paleoproterozoic era.
4.3%
Shiladitya DasSarma
Indian-American biologist (born 1957).
4.3%
Red edge
Region of change in vegetation reflectance.
4%
Porphyrin
Class of organic compounds.
2.4%
Readers come from
Share of the 5,373 readers arriving from another article
Great Oxidation Event
Paleoproterozoic surge in atmospheric oxygen.
29%
Retinal
Vitamin A aldehyde, a polyene chromophore.
11%
Hypothetical types of biochemistry
Possible alternative biochemicals used by life forms.
4.6%
Chlorophyll
Green pigments found in plants, algae and bacteria.
4.3%
Photosynthesis
Biological process to convert light into chemical energy.
3.8%
Purple bacteria
Group of phototrophic bacteria.
2.4%
Red edge
Region of change in vegetation reflectance.
2.1%
Haloarchaea
Class of salt-tolerant archaea.
1.8%
Bacteriorhodopsin
Protein used by single-celled organisms.
1.3%
Purple
Range of colors with the hues between blue and magenta.
0.2%