Photosynthesis before oxygen may have kept the early Earth warm

Photosynthesis. (credit: Petr Pakandl / WikiCommons)

“The so-called ‘faint young Sun paradox’ has long been a topic of debate because its resolution bears important ramifications for the basic factors structuring climate regulation and the long-term habitability of Earth and Earth-like exoplanets.” So begins Chris Reinhard’s new paper in Nature.

Reinhard is a Principal Investigator at the Alternative Earths Team of NASA’s Astrobiology Institute, which has a goal of...

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