Cat said:
Amino acids are organic compounds, essential to cellular life. I.a. the experiment produced adenine, one of the four bases of DNA/RNA and essential part of the Krebs cycle.
I said it was a simplistic argument, just to show the first bases of evidence that life can be created by chance. After Miller, many more experiments have been made, none of them as famous as the first one, but nevertheless all of them adding information and confirmation to the first hypothesis (Szostak for instance has found triphosphates). Miller's experiment was very crude and simple, but already gave spectacular results. Not life in the sense of full-blown monocellular organisms, but the essential bases of life.
Near my aunt's house in Malaysia lies a marble quarry. It's a noisy busy place where workers a busy mining marble for use in building houses. If you strolled around the place, you'd see lots of blocks/slates of marble waiting to be shipped to construction sites to be used.
However, just because the marble exists, doesn't mean that the Taj Mahal would soon follow. Sure, you find the marble in the ground but it's a very long way from being the Taj Mahal.
Likewise, having the basic amino acids is a very very long stretch from having celullar life. Most researchers see the Miller Urey experiments as a dead end and are now focusing their efforts elsewhere.
No, it does not require the absolute absence of oxygen. The atmosphere of the earth at the time did contain very little amounts of oxygen (remember, no life yet, no plants, hence no oxygen). Oxygen was present in compounds, but _under water_ (which is what we are talking about) O2 does not abund loosely. So that is not a flaw of the experiment.
It is a flaw in the experiment because (IIRC, been a long while since I did chemistry) H2O breaks down in the presence of UV light. Granted, it's very very small percentage of it, but it still breaks down regardless.
This is where the experiment is unrealistic. Normally, I'd suggest that you'd try to run the experiment with the conditions I've stipulated to see for yourself the effects of oxygen in the mixture, but knowing the results, I highly advise you NOT to do so.
Miller obtained his results after only five days, the earth has hade more like 5 million years. Criticizing the metaphor is not an argument.
Yet, after 50 years of research by really bright minds has brought people no where nearer to the solution. If that is the case, perhaps a different angle needs to be sought?
Your critcism closely follows that of Jonathan Wells ... who has been discredited and contradicted time and again ...
Having never heard of Jonathan Wells, a quick Google search brought me to this
page. Is he the guy you're talking about? Browsing his site, he seems to supports my views so I'm guessing its him you're referring to.
As for his arguments being discredited, look at his responses and you'll see that there isn't really anything flawed about his reasoning. NOTE: I haven't read through his entire site, or his book so I don't pretend to know ALL his arguments. Some could well be very tenuous.
What one generation of scientists knows, the next generation will question and disprove. Perhaps the criticisms that this Johnathan Wells attracts is similar to he criticism that Darwin attracted in the 19th century when he first put forth his THEORY of evolution?
As a staunch atheist before I became a Christian, I used to believe strongly in evolution. Imagine my surprise when I found out later that the 'experiments' that my biology textbooks listed as demonstrating evolution had serious flaws in them. Thankfully, this isn't going to be much of a problem since publishers have been asked to retract a lot of the factual errors (see the link in my last post).