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Must exist no. Probably exist yes.
Probability ratios usually come with a numerator and a denominator. So you are saying the probability of so many physical laws being fine tuned for life, let alone complex intelligent life, is very low- on the order of... what? 1/trillions and trillions, right? In fact, if you really think about it, it may be on the order of 1/infinity- IOW, basically zero.
And that makes sense. I get it. It's a compelling argument. Scientists as smart as recently as Stephen Hawking were very impressed by these low odds of these "fine tuning for life" arguments.
But here is what we are finding: we don't really know the size of the numerator in that ratio. First of all, we don't know if there is other life elsewhere even in our own solar system- let alone other solar systems in our galaxes, or even in the more than 2 TRILLION galaxies in the visible universe- each containing at least hundreds of billions of stars. And all this is not to mention that we don't even know how many galaxes exist outside of our visible universe. We know there is stuff out there beyond our visible horizon due to the supraluminal expansion of space after the big bang. So what if there are infinite other universes entirely outside our own? What if there are an infinite number of universes popping into and out of existence throughout space/time? What if all these other universes all had physical laws of their own, with their own physical constants and laws? We are talking about an infinite number of universes with an infinite number of physical laws and their combinations. Couldn't that eventually lead to places and times in this multiverse where the combination of constants were all just right to create intelligent life which would then be left wondering what are the odds of those constants being just right for them to exist?
So although the denominator in that ratio is basically infinite, you can see that the numerator in that ratio could also be potentially infinite. So then we are dividing infinity by infinity. What does that give us mathematically? It gives us a mathematically undefined quantity. That's why we just don't know.
In fact, recent developments in M theory, which Stephen Hawking elaborates on in his book "The Grand Design", does just exactly that. In fact, that is why even someone who was as initially impressed with these fine tuning arguments like Hawking, finally declared toward the end of his final book: "“It is not necessary to invoke God to light the blue touch paper and set the universe going.”
The Grand Design: Stephen Hawking, Leonard Mlodinow: 8580001054193: Amazon.com: Books
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