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?

I WAS an SEC football fan. I'm not whether I'm allowed to be now. Can I not discuss the game with friends the next day now? Fuck that.

The red dwarf star Gliese 710 is predicted to come within nearly 1 light-year of the Sun ... about 1.5 million years from now

Its no problem as long as it only runs over the corpses that have been reanimated.