Ancient Climate on Earth Reveals Origins of Life--But Not with Nitrogen

October 4, 2013 9:22 AM

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Why did life evolve when it did on Earth? That's a mystery that scientists have been trying to piece apart for years. Now, this riddle may have gotten a bit more complicated. Researchers have now ruled out a theory as to why the planet was warm enough to sustain Earths' earliest life forms when the Sun's energy was roughly three-quarters of the strength it is today.

Life is estimated to have evolved on our planet during the Archean, a time between 3.8 and 2.4 billion years ago. At the time, though, the weak Sun should have meant that the planet was simply too cold for life to take hold. That's why researchers have tried to find an explanation for how life was p...

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