After Urey – Miller’s experiment in 2006 another experiment showed that a thick organic haze might have blanketed Early Earth. An organic haze can for

• After Urey – Miller’s experiment in 2006 another experiment showed that a thick organic haze might have blanketed Early Earth. An organic haze can form over a wide range of methane and carbon dioxide concentrations, believed to be present in the atmosphere of Early Earth. After forming, these organic molecules would have floated down all over the Earth, allowing life to flourish globally.
• Another theory about the origin of life was given in 1980s by Gunter Wachtershauser, in his theory. In contrast to the classical Miller experiments, which depend on external sources of energy. Wachtershauser systems come with a built in source of energy, sulphides of iron and other minerals. The energy released from redox reactions of these metal sulphides is not only available for the synthesis of organic molecules, but also for the formation of oligomers and polymers. It is therefore hypothesized that such systems may be able to evolve into autocatalytic sets of self-replicating, metabolically active entities that would predate the life forms known today.
• A theory for the origin of life based on clay was forwarded by Dr. A. Graham Cairns-Smith of the Unversity of Glasgow in 1985 and adopted as a plausible illustration by just a handful of other scientist. Clay theory postulates that complex organic molecules arose gradually on a pre-existing, non-organic replication platform made of silicate crystals in solution. Complexity in molecules developed as a function of selection pressures on types of clay crystals present. They then served as the replication of organic molecules independently of their silicate “launch stage”.