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Artist's impression of an asteroid impact on early Earth (credit: NASA)

Solar System

Rethinking the Source of Earth’s Water

12 Jul , 2012 by John Williams

Earth, with its blue hue visible from space, is known for its abundant water – predominately locked in oceans – that may have come from an extraterrestrial source. New research indicates that the source of Earth’s water isn’t from ice-rich comets, but instead from water-bearing asteroids. Looking at the ratio of hydrogen to deuterium, a […]

carbonaceous chondrites, Carnegie Institution for Science of Washington, Early Earth, NASA

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