Some scientists believe that 3.6 billion years ago Earth might have been purple, and that theory is giving us some clues in our search for life in the universe.
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Sources:
https://doi.org/10.1088/2041-8205/728/1/L6
https://www.ncbi.nlm.nih.gov/books/NBK22535/
https://doi.org/10.3390/sym6030781
https://doi.org/10.1038/35059215
https://doi.org/10.1128/microbe.1.120.1
https://doi.org/10.1017/S1473550418000423
https://pubmed.ncbi.nlm.nih.gov/27630250/
https://doi.org/10.1117/12.2530036
https://ecampusontario.pressbooks.pub/microbio/chapter/photosynthesis/
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