Saturday, April 20, 2013

Does Moore’s Law Imply That Life On Earth Arrived From Elsewhere?

origin of lifeDoes Moore’s Law Imply That Life On Earth Arrived From Elsewhere?:
The MIT Technology Review writes that earthly lifeforms appear to have 10 billion years’ worth of complexity, yet our planet is only 4.5 billion years old. So do our origins lie elsewhere?
As life has evolved, its complexity has increased exponentially, just like Moore’s law. Now geneticists have extrapolated this trend backwards and found that by this measure, life is older than the Earth itself.
Alexei Sharov at the National Institute on Ageing in Baltimore and Richard Gordon at the Gulf Specimen Marine Laboratory in Florida argue that it’s possible to measure the complexity of life and the rate at which it has increased from prokaryotes to eukaryotes to more complex creatures such as worms, fish and finally mammals. That produces a clear exponential increase identical to that behind Moore’s Law although in this case the doubling time is 376 million years rather than two years.
That raises an interesting question. What happens if you extrapolate backwards to the point of no complexity–the origin of life? “Linear regression of genetic complexity (on a log scale) extrapolated back to just one base pair suggests the time of the origin of life = 9.7 ± 2.5 billion years ago,” Sharov and Gordon say.
And since the Earth is only 4.5 billion years old, that raises a whole series of other questions. Not least of these is how and where did life begin.
There’s no question that this is a controversial idea that will ruffle more than a few feathers amongst evolutionary theorists. But it is also provocative, interesting and exciting.
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