Thursday, November 19, 2009

Why didn't Earth's oceans freeze 2.5 billion years ago?

Experts believe the sun was too faint 2.5 billion years ago to keep the Earth's oceans from freezing. But best we can tell, they didn't. Why? It remains a mystery, but NASA scientists say if there were more nitrogen in the early atmosphere than there is today, then "the [resulting] pressure rise would have led to more collisions between [greenhouse gas] molecules… causing them to absorb more infrared wavelengths." (New Scientist)

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I started pound360 to channel my obsession with vitamins, running and the five senses. Eventually, I got bored focusing on all that stuff, so I came back from a one month hiatus in May of 2007 (one year after launching Pound360) and broadened my mumblings here to include all science.