4 billion years ago, the Sun was cooler than it was today, but much more active. Earth’s weaker magnetosphere allowed particles from solar flares to seep into the atmosphere, contributing to the creation of the greenhouse gas nitrous oxide.
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from Innovation and Digital Marketing http://www.livescience.com/54850-brewing-life-on-earth-violent-sun-weak-shielding-may-have-contributed-video.html?utm_source=rss&utm_medium=rss
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