@gwern @cinnamon_carter It posits a reasonable working assumption about complexity growth instead of hand-waving about "open niches".
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@NickSzabo4@cinnamon_carter Why does it need to catch to grow or spread or evolve w/o competition? Does not catching prove panspermia?
@gwern @cinnamon_carter Many far more likely places in universe to find stable amino+nucleic acid soup than bombardment-era Earth.
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@NickSzabo4@cinnamon_carter Be that as it may, what does that have to do with linearity of genomes as clocks and that paper's model? -
@gwern@cinnamon_carter Linearity is just a good initial way to avoid "and now a miracle occurred" assumptions that plague these debates. -
@NickSzabo4@cinnamon_carter Arggh. No, the linearity drives the entire extrapolation beyond Earth in that paper! -
@gwern@cinnamon_carter Prokaryote-like fossils appear as soon as Earth bombardment ends. -
@gwern@cinnamon_carter Thinking about genomic complexity & chemical ability shows effective impossibility life originated then & there. -
@NickSzabo4@cinnamon_carter If it appeared before, how could you ever know? The bombardment censors observations. That was what I meant. -
@gwern@cinnamon_carter We should reason from what we know: chemical abilities of metabolisms and the genomic complexities those require. -
@NickSzabo4@cinnamon_carter It's still unclear if 'genomes' proper are needed or if RNA World (or pre-RNA!) didn't do both simultaneously. - 10 more replies
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