Bok
10-25-2011, 12:39 AM
To become a world bathed in oceans of water and habitable, Earth first had to take a beating. A popular hypothesis holds that icy comets and asteroids pummeling early Earth delivered the planet's water from the icy outer reaches of the solar system. [More] (http://www.scientificamerican.com/article.cfm?id=ice-comets-tw-hydrae)
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