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Besides the blue of the oceans, the dominant color of our planet, as we know it, is green. But imagine a time when the Earth looked a little … purple.

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References:
https://www.livescience.com/1398-earl...
http://www.jstor.org/stable/27858961
http://www.amnh.org/explore/science-b...
https://origins.asu.edu/blog/oxygenat...
https://www.scientificamerican.com/ar...
https://www.asm.org/ccLibraryFiles/FI...
http://science.jrank.org/pages/5195/P...