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Chlorine photosynthesis on exoplanets
I tend to think that oxygen and chlorine could coexist on some planets, just like methane and chlorine co-existed on Precambrian Earth. Of course the chlorine would be little more than a trace - but if it were continually replenished, it would be significant enough to make the atmosphere toxic to humans.

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RE: Chlorine photosynthesis on exoplanets - by stevebowers. - 03-27-2013, 08:05 AM

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