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Alternate way to make oxygen found: process may alter view of how Earth's atmosphere formed.
With a zap, a beam of ultraviolet light can blast carbon dioxide into oxygen gas, [O.sub.2]. Because the sun hurls UV radiation, the reaction hints that breathable air could have formed on Earth before the dawn of photosynthetic organisms or even in other C[O.sub.2]-rich atmospheres like those on Mars and Venus, researchers argue in the Oct. 3 Science.
Though scientists had theorized that the detritus of a C[O.sub.2] breakup could include [O.sub.2], proving it has been extremely...
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