Life existed long before earth came into being and may have evolved somewhere outside our solar system. Researchers say life first appeared about 10 billion years ago. Long before earth came into existence which is believed to be 4.5 billion years old. Genetics have applied Moore's law which states that computers increase exponentially in complexity, at a rate of about double the transistors per integrated circuit every two years - to the rate at which life on earth grows in complexity. Alexei Sharov of the National Institute on Ageing in Baltimore, and Richardson Gordon of the Gulf Marine Laboratory in Florida, replaced the transistors with nucleotides-the building blocks of DNA and RNA - and the circuits with genetic material. Their findings suggest life first appeared about 10 billion years ago, far older than Earth's projected age of 4.5 billion years. (TechDailyNews) reported.
However the calculations are not a scientific proof of that.
Here are lots of hypothetical elements to (our argument ) ... but to make a wider view, you need some hypothetical elements," Sharov said.
Sharov said that if he had to bet on it, he'd say "it's 99% true that life started before Earth — but we should leave 1% for some wild chance that we have not accounted for."
The theory of "life before Earth" , if found true, debunks the long-held sciencefiction trope of the scientifically advanced alien species.
Moreover, if genetic complexity progresses at a steady rate, then the social and scientific development of any other alien life form in the Milky Way galaxy would be roughly equivalent to those of humans, the report said.
"Contamination with bacterial spores from space appears the most plausible hypothesis that explains the early appearance of life on Earth," Sharov said.
Courtsey : Times of India
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