Life on earth: a fluke or inevitability?

[Avalach21]

akuma587 said:
No idea? Come on, do some research on your own. We have created relatively complex self-produced and self-replicating molecules in laboratories with similar conditions as those on early Earth within the span of a few decades. Not to mention the Earth was around for at least a billion years before any life showed up. A lot of things can happen in a billion years.

 

First off, they made a couple amino acids in the models, but have no idea how these amino acids would come together to form life.

 

Second off, the Earth did not have a billion years for life to show up.  During the first Billion or so years, up until 3.8 billion years ago, the Earth was experiencing the Late Heavy Bombardment.  In this period, vast amounts of foreign objects were continuously pelting the Earth (and all other nearby planets).  All of the oceans vaporized, and all solid rock melted.  The earliest fossils found of Earth are 3.5 billion years old (some stromatolites).  This leaves .3 billion years for primitive life to form.