January 4, 2013

Maybe the Early Earth Wasn't a Snowball

Emily Elert, Popular Science


AP Photo

When our sun first got going, some 4.5 billion years ago, it wasn't the same blazing star we know today--its warmth and brightness grew gradually as more and more of its fuel ignited. So, for Earth's first two billion years, our planet was bathed in a light 25 percent dimmer than it receives today.

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TAGGED: Early Earth, Snowball Earth, Atmosphere