How far has the Urey- Miller experiment been taken?
I figure by now some scientists took it farther than they did. Did those scientists stop at a certain point, because they were afraid of creating some new, scary form of life? What's been going on in this field of research, if anything?
There has been a lot done in this area of research and there are many competing ideas. The International Society for the Study of the Origin of Life has been publishing a journal (Origins of life and evolution of the biosphere) on this topic since the 1980's. If you are interested in a career in research, this could easily be your area.
To get started, the Wikipedia article on abiogenesis (the study of how life arises from inorganic matter through natural processes) has a very nice reading list at the end of the article here http://en.wikipedia.org/wiki/Abiogenesis#Further_reading of various recent books on the subject. There is a fair student paper summarizing current ideas here http://student.science.uva.nl/~jckastel/html/abiogenesis.pdf
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