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Big Al

Do you know the ditty about the old lady who swallowed a spider?
I am puzzled by the hydrogen peroxide story, I thought there was no free oxygen on Mars, so what is oxidizing the water to Peroxide?

Elaine Meinel Supkis

There is a small amount of oxygen and water, I believe, and in the past, when the scouring was done, there was a lot more water and oxygen in the atmosphere, I am guessing.

Big Al

Yes but Pure H2O2 is very unstable, and with the lower pressure on Mars the decomposition rate will be faster, 90% peroxide is more unstable than 100%.

Elaine Meinel Supkis

But this all happened about 500 million years ago. At that time, our own climate was totally different, too.


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