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Comment: Re:How sure? (Score 1) 148 148

They determined the glycine was of extraterrestrial origin by measuring the amount of carbon-13 present and found it to be different from the earth. So, it didn't come from the earth. But, what always confuses me, if the carbon-13 ratios are different on the earth compared to comets, doesn't that argue that they formed from different source material?

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