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

by Grayswan (#29114317) Attached to: NASA Discovers Life's Building Block In Comet

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?

The unfacts, did we have them, are too imprecisely few to warrant our certitude.