Originally posted by Kazan
Wanderer: they think the first replicators were simple RNA chains - and it's very easy to determine what the atmosphere was made out of in times passed because of gas-capture by rocks and ice.
aldo_14: Although it's now believed the primoridal atmosphere was a less reactive combination - for a while that was true, but that was the false assumptions i made reference too. Further study has found that the primordial atmosphere was atleast, if not more, reactive than the mixture Urey-Miller used.
I was going by a book published 2003, so fair enough. The source cited was, IIRC, H2O by Ball, which is dated 2000. So it's obviously somewhat problematic relying on books for this sort of thing, but the internet has it's own problems with a lot of deliverate disinformation. I swear, if I see another 'science' page quoting ****ing
Gish I'll explode into incadescent rage. Or mild annoyance.
What I've been able to find out was that about that time geologists believed volcanic activity would have massively increased levels of less reactive CO2, etc in the atmosphere; presumably the basis for the previous. But since then they've determined there could/would likely be a significant methane contribution from volcanic seabed activity.
Albeit, I suppose it's somewhat of a moot point as they've been able to form amino acids within the (simulated) co2-heavy atmosphere model, just in lesser quantities and more difficulty.
(As an aside, I finally got round to ordering
The Blind Watchmaker, having spent weeks trying to find it in normal bookshops. You'd have though a gigantic Borders would have it, but nooooooo)