Could life be older than Earth?

Alexei A. Sharov and Richard Gordon published on a paper that shows their calculations: given the fact that the complexity of life doubles once every 376 million years, it seems that, going back in time, life could be about 9 billion years old. Or it could simply mean that life took more steps in the past than in current times.

Also, Abraham Loeb from Harvard University proposes the idea that, at an early stage of the Universe when the first planets were formed, the Universe was hot enough to allow liquid water to exist on some planets.

That might raise the idea that life existed way before Earth and that life, at least in microbial form, may be way more abundant than previously thought. Right now, we know for certain that we are alone in this part of the Universe or of the Solar System.

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