@gwern @cinnamon_carter Niches that required photosynthesis, nitrogen fixing, and even many far simpler capabilities were unavailable.
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@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.
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@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. -
@gwern@cinnamon_carter The issue is the complexity needed to encode, whether in RNA or DNA, metabolic functions. -
@NickSzabo4@cinnamon_carter The issue is assumption length must follow a exact linear form extrapolated back 9bya from present-day data. -
@gwern@NickSzabo4 If most depend on the previous this is a logical method to begin, at least as a baseline. -
@cinnamon_carter@gwern +1 It's just a simple way to formalize the general idea that evolution proceeds gradually, not by miraculous leaps. - 6 more replies
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@NickSzabo4@cinnamon_carter Unsurprisingly under either model.Thanks. Twitter will use this to make your timeline better. UndoUndo
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