Vastavus said:
In 1953 chemists Stanley Miller and Harold Urey at the University of Chicago devised and experiment using methane, hydrogen, ammonia and water vapor to simulate atmospheric conditions during the Archean Period (Beginning of life on Earth). The equivalent of lightning, generated by an electric discharge, was arced though the gassy mixture, and eventually formed four amino acids, which are the basic building blocks of protein. Further experiments produced carbohydrates and the ingredients for nucleic acids: RNA and DNA. The building blocks of life.
In this matter scientists have show how life can form from non-life.
I've read this before and found it interesting. However, a few things have been pointed out concerning it. I'll work through the thought processes of those who have worked on this idea since Urey-Miller's time:
First of all, much of this hinges on whether or not experimenters used an atmosphere that accurately simulated the environment of the early earth. IIRC, Miller's initial experiments were relying heavily on the atmospheric theories of his doctoral adviser -- the Nobel lauriate Harold Urey.
While nobody knows for sure what the early atmosphere was like, the consensus (now) is that it was not at all like the one Miller used.
Miller seems to have chosen a hydrogen-rich mixture of methane, ammonia, and water vapor. This is what was consistent of what scientists thought the atmosphere was like back then. But scientists don't believe that anymore. Even back in the 1960's there was doubt. For example, the geophysicist at the Carnegie Institution said, "What is the evidence for a primitive methane-ammonia atmosphere on earth? The answer is that there is no evidence for it, but much against it."
By the mid 1970's, Belgian biochemist Marcel Florkin was already declaring that the concept behind MIller's theory of the early atmosphere "has been abandonned". In fact, two of the leading origin-of-life researchers, Klaus Dose and Sydney Fox, confirmed that Miller had used the wrong gas mixture. Science magazine said in 1995 that experts now dismiss Miller's experiment because "the early atmosphere looked nothing like the Urey-Miller simulation."
The best hypothesis now is that there was little hydrogen in the atmosphere because it would have escaped into space. Instead, the atmosphere probably consisted or carbon dioxide, nitrogen, and water vapor. The Miller experiment seems to use assumptions about the earth's early atmosphere that most geochemists have rejected since the 1960's.
If you replay the experiement using an atmosphere that geochemists suspect, you do not get amino acids. Some would claim that if you replayed the experiment using an "accurate" atmosphere, you'd still get organic molecules.
While "organic molecules" might sound promising, it quickly deflates when one realizes exactly what would have been formed if using an acurate atmosphere: formaldehyde and cyanide.
Sure, these might be "organic molecules" -- but most researchers couldn't even keep a capped bottle of formaldehyde in their room because the stuff is so toxic. If you open the bottle, it would fry proteins all over the place (just from the fumes). It kills embryos and is otherwise known as embalming fluid.
While there's no doubt that a good chemist can turn formaldehyde and cyanide into biological molecules, suggesting that formaldehyde and cyanide gives you the right substance for the origins of life are humorous.
Now let's say that someone actually did manage to produce amino acids from a realistic model of the early earth's atmosphere, or perhaps assume that amino acids came from a comet or some other means: how far would this be from creating a living cell?
You would have to get the right number and the right kind of amino acids to link up and create a protein molecule -- and that would still be a long way from creating a living cell. Then you'd need dozens of protein molecules, again in the right sequence, to create a living cell. The odds against this are astonishing (and I think that this is what an athiest once mentioned in an article -- that the chances of this happening are so remote that one could realitically invoke an intelligent agent for its initial formation). The gap between nonliving chemicals and even the most primitive living organisms is absolutely tremendous.
If you put a sterile, balanced salt solution in a test tube, and then you put in a single living cell and poke a hole in it so its contents leak into the solution, you would now have all the molecules you would need to create a livng cell. You've already accomplished more than what the Miller experiment ever could -- you've got all the components you need for life.
If one wants to create life, on top of the challenge of somehow generating the cellular components out of non-living chemicals, you would have an even bigger problem in trying to put the ingredients together in the right way.
So even if you could accomplish the thousands of steps between the amino acids in the Urey-Miller (which apparently didn't exist in the real world anway) and the components you need for a living cell (all the enzymes, the DNA, and so forth), you're still immeasurably far from life despite claims to the contrary.
Now I'll grant that the "first cell" could possibly be even more primitive than the most simple single-cell organism today. But the point still seems to remain the same: the problem of assembling the right parts in the right way at the right time and at the right place, while keeping out the wrong material, is (in some people's opinions) simply insurmountable.
Even biochemist (and spiritual skeptic) Francis Crick cautiously invoked the word a few years ago, "An honest man, armed with all the knowledge available to us now, could only state that in some sense, the origin of life appears at the moment to be almost a miracle, so many are the conditions which would have had to have satisfied to get it going."
If there isn't a natural explanation and there doesn't seem to be the potential for finding one, then some believe its appropriate to look at a supernatural explanation -- at least in so far as the Scriptures appear to make such claims. They think it's the most reasonable inference based on the evidence in accordance with their faith.