Hazy antidote to a faint young sun

New theory suggests atmospheric answer to the paradox about early Earth’s temperature

By Sid Perkins, 13:15 PM June 3, 2010

How do you keep a chilly youngster warm? Wrap it in a blanket, of course. Turns out that a blanket of haze might have warmed Earth during its infancy, when the sun was substantially dimmer. That might have kept the planet from freezing, as some studies suggest its fate would have been otherwise.

Theories abound about why Earth didn’t freeze during the first half of its history, even though the sun was about 30 percent dimmer then than it is today. Just over a month ago, one team suggested t...

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