LIFE LINE: Earth's atmosphere, as seen from space, allowed life to thrive on the planet, but how it originated and evolved remains an open question. NASAFrom Scientific American:
Krypton trapped in Earth's mantle appears not to have been captured from the sun, as some models would predict.
A precision analysis of gases from Earth's mantle collected at a geologic formation in the U.S. Southwest points to a source for the gas that more closely resembles carbonaceous meteorites than it does the sun. If confirmed by further research, the new study would challenge a theoretical model for atmosphere formation in which Earth began with two reservoirs of solar gas captured during the planet's formation and youth—one surrounding the planet, the other buried beneath the surface.
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