No one on this planet has a satisfying answer as to how life started on Earth or in the universe. This part is pretty much obvious.The less obvious part is the Herculean effort put in by researchers over the years to question, reason and argue how it all came about. And a portion of that effort can be found in Paul Davies' The Origin Of Life, where he widens the argument and speculates the possibility that life might have blasted into Earth from Mars, or vice versa, through asteroid impacts. (Sounds unlikely and wildly speculative, but still remotely possible.)
If that was true, it probably only serves to further complicate a very complex and unresolvable problem: What even kick started this process of life in the first place, regardless from where it came from?
The science that is covered in the book can be considered to be not tough, unless there is already some fluency on the part of the lay reader in chemistry, biology and physics.
Otherwise, to refrain from being overwhelmed by science is to be mindful that even though science might be taking us somewhere by enhancing its ever increasing explanatory powers, it is the pleasure of finding things out that is essentially driving researchers on, and not necessarily the search for the ultimate explanation.
Good thing Davies isn't deluded enough to claim to ever be privy to all the answers.
Oh, you like science writing?
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I see. So you're a hardcore skeptic?
Then you could get your hands on:
