Is the Universe Fine-Tuned for Human Life?

Updated on July 21, 2017

Gazing in Awe at the Universe

The universe is a source of wonder and mystery for many.
The universe is a source of wonder and mystery for many. | Source

What Is the Fined-Tuned-Universe Notion?

In simple terms, the argument for a fine-tuned universe states that the probability of the various mathematical constants of the universe being exactly what is needed for life is so unlikely that it could not have occurred just by chance. Therefore, an “Intelligent Designer” (God) must have created the laws of physics in order to create a universe that was capable of supporting human life.

At first glance, the argument seems to make sense. But a little bit of thought will show you that the assumption of a fine-tuned universe doesn't make sense. The better assumption is that life fine-tuned itself, via evolution, to fit the conditions found in the universe.

If the laws of physics were different, there would be no universe, and if the laws of chemistry were different, there would be no life. In that case, there would be no humans to say the universe was fine-tuned for them.

Let’s look at some of the reasons against the notion of a universe created and fine tuned-for the existence of life, and more specifically, for the existence of human life.

What Are “Mathematical Constants”?

Let’s begin with a look at mathematical constants.

The term “mathematical constants” refers to unchanging mathematical values that are observed in the universe. For instance, pi is a constant; the speed of light in a vacuum is a constant. In order for the universe to exist, dozens of these constants, the “laws of nature,” must have exactly the value that they have.

Physicists have developed “The Standard Model” to describe everything known about the universe from quantum mechanics on the sub-atomic level to the cosmological forces such as gravity, electro-magnetism, the weak nuclear force, and the strong nuclear force. It also includes things like the mass and charge of electrons, protons, neutrinos, and quarks. Even the Earth’s orbit must be almost precisely what it is.

If any of these mathematical constants were different, the universe could not exist. It would have either collapsed in upon itself or been unable to hold itself together. Stars and planets could not form the elements necessary for life (like carbon), and the chemical and biological processes that produced and now sustain life could not occur.

How can we explain what seems like a remarkable and improbable coincidence of all the mathematical constants,being exactly as they are in order for our universe (and us) to exist?

A Famous Formula

Einstein's famous formula was derived from his Special Theory of Relativity.
Einstein's famous formula was derived from his Special Theory of Relativity. | Source

What Is the Anthropic Principle?

There are two anthropic principles, the weak anthropic principle and the strong anthropic principle. They were put forth by astronomer Cater Brandon in 1974.

  • The weak anthropic principle is the idea addressed in the first section of this essay. The fact that we exist means that the universe must have the characteristics that allow us to exist. If they were not, we would not be here to muse about why we are here. This principle is widely accepted
  • The strong anthropic principle is more controversial. It states that only a universe that is capable of sustaining life at some point of its existence is capable of existing. Since we live in a universe that is capable of sustaining life, we must therefore conclude that only life-sustaining universes are possible.

Cosmologists have since come up with 30 additional variations of the anthropic principle. For example, one draws upon quantum physics--it states that no universe can be real until it is observed.

What Are the Odds for the Existence of Our Universe?

The probability that all of the mathematical constants would be exactly as they are by random chance has been estimated to be 1 part in 10 to the power of 234. Those are really long odds.(UCF News)

However, that calculation results from a misunderstanding of probability. Probability theory is used to predict future events, not to explain the likelihood of an event that has already occurred.

The probability of all the mathematical constants being exactly what they are is 100% because it is something that has already happened.

What Is the Principle of Mediocrity?

Cosmologists now know that our solar system is not unique. There are many other stars with planets. Many of these planets are similar to Earth in terms of mass, density, orbit, chemical composition, etc. Some of them even fall within what is called “The Goldilocks Zone” of their star. (This is the zone in which liquid water can exist, neither too hot nor too cold. Without liquid water, life as we know it cannot exist. Fortunately for us, Earth is within the Goldilocks zone.)

There is nothing special about our sun and our planet—they are mediocre. If they were unique, the fine-tuned argument would be stronger.

An Infinite Number of Universes

A multiverse means there could be billions of galaxies.
A multiverse means there could be billions of galaxies. | Source

Are There an Infinite Number of Universes?

Some cosmologists posit a multiverse where there are an infinite number of universes. Some of these other universes may have different physical constants. If so, it is not improbable that one of them would have the physical constants that make life as we know it possible.

Think of it this way. Let’s say you buy a lottery ticket and the odds of winning are one in 100 million. Let’s assume that all the tickets are sold and each ticket has a different number. It is very unlikely that your one ticket will be the winner. However, there will be ONE ticket that IS the winning ticket.

In this analogy, the lottery tickets represent all the possible universes and the winning ticket represents a universe in which human life exists. The odds are impossibly high only if you think the purpose of the lottery is for your one ticket to be the winning ticket. If you don’t care which ticket wins, the odds are 100%.

Are There Different Kinds of Universes?

We can only look at one universe, the one we live in. We can’t make good judgments about what is possible based on a sample of one.

If there are infinite universes, maybe every one of them is exactly like ours because the laws of physics allow no variation. Maybe gravity must be exactly what it is—there is no range.

Or, maybe the constants are not independent. If gravity is has a particular value, then the speed of light and all the other mathematical constants must be at a particular value.

An Asteroid Strike

An asteroid or meteor strike could kill millions and maybe destroy the Earth itself.
An asteroid or meteor strike could kill millions and maybe destroy the Earth itself. | Source

Why Is the Universe Always Trying to Kill Us?

If the universe was created to be perfect for us, why is the universe (an even the Earth) constantly trying to kill us?

Earth doesn’t seem so fine-tuned for human life to me.

  • There are lions and tigers that can eat us. There are spiders and snakes that can poison us.
  • There are tornadoes and hurricanes that can toss us about like rag dolls.
  • There are bacteria and viruses that can infect us with diseases that kill us.

The universe is trying to kill us also. The radiation found in outer space is deadly. (Even radiation from our own sun can give us skin cancer.) And comets and asteroids could crash into the Earth at any time. The universe seems to be a pretty lethal place.

Why Are Humans So Badly Designed?

If humans are designed, why didn’t the designer do a better job of it? Why do we have “bad backs,” poor eyesight, imperfect memories, etc? Why don't we have three hands? How many times have you said, "I wish I had a third hand."

Maybe because evolution formed us to be just good enough to survive as a species; nature doesn’t need us to be perfect.

Humans don’t appear to be fine-tuned.

Are Humans Really the Purpose of the Universe?

Humans appear to have evolved on earth by chance. If a comet hadn’t hit the Earth resulting in the extinction of dinosaurs, it is likely that the only mammals on this planet would be rabbit-sized and rabbit-brained. Dinosaurs would still rule the Earth, and maybe those dinosaurs might think the Earth was made for them.

Of course, God could have sent the comet to kill off the dinosaurs, but why create them just to kill them off. And if He killed off the dinosaurs, can you really be sure that He will not kill off the humans some day. Maybe He sent atomic weapons for that purpose.

Is the Idea of a Fined-Tuned Universe Just Anthropocentrism?

The fine-tuned argument assumes that the purpose of the universe is human beings. What if the universe has no purpose? What if the universe just exists, and here and there conditions are just right for life?

Humans do not seem to be the purpose of the universe. I doubt the universe has a purpose, but if it does, maybe humans are just a by-product of this other purpose.

There is no reason to think that God or an Intelligent Designer created the universe just for humans. It is just speculation without any basis. You might as well say an alien species from another universe created this universe and all it contains, including us. Or maybe it is all a simulation on a video game—Sim-Universe.

If the existence of the universe is improbable, isn’t it even more improbable that an “Intelligent Designer” created it.

A Famous Quote from Douglas Adams

A famous analogy from Douglas Adams about how a puddle might think the hole it finds itself in was made just for it.
A famous analogy from Douglas Adams about how a puddle might think the hole it finds itself in was made just for it. | Source

What is The Puddle Analogy?

Douglas Adams, best known for his quirky science fiction novels, came up with the perfect analogy that illustrates our anthropocentrism. It was part of a speech he gave at a 1998 conference, Digital Biota 2, at Cambridge, U.K.) It was later incorporated into his posthumous book, The Salmon of Doubt: Hitchhiking the Galaxy One Last Time(2002, Harmony Books. p. 131)

“Imagine a puddle waking up one morning and thinking, ‘This is an interesting world I find myself in — an interesting hole I find myself in — fits me rather neatly, doesn't it? In fact, it fits me staggeringly well, may have been made to have me in it!’ This is such a powerful idea that as the sun rises in the sky and the air heats up and as, gradually, the puddle gets smaller and smaller, it's still frantically hanging on to the notion that everything's going to be alright, because this world was meant to have him in it, was built to have him in it; so the moment he disappears catches him rather by surprise.”

I'll let Douglas Adam have the last word.

The Grand Design

The Grand Design
The Grand Design
This essay was inspired by reading "The Grand Design" by Stephen Hawking. Most of the facts about cosmology, physics, and mathematical constants that I cited in this essay were taken from this book. (The opinions are my own.) Hawking and his co-author , Leonard Mlodinow) have produced a very readable book that took me through the history of human thinking about the universe and brought me to the cutting edge of the strange and wonderful science of modern cosmology.

What Is Your Opinion?

Which statement comes closest to your beiief about the universe?

See results

Fine-Tuning in Brief


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    • profile image


      13 months ago

      Catherine, your arguments against fine tuning makes perfect sense except for theology. I mean it's impossible to understand fine tuning if you don't believe the bible. The universe was created perfectly fined-tune for life, but the FALL altered some of the properties and laws required for such fine tuning. In the beginning there was no death, no illness, no poor eyesight, no earthquakes or tornadoes and no cancer. Here's where the buck stops, because most likely as part of your evolutionist worldview, the fall, sin, and Adam & Eve makes no sense to you. So the universe was not badly designed, neither the human body, it just became that way because of man's actions. Still, even taking for granted the bad design argument, there's a lot of fine tuning which cannot be explained by chance and time alone. Otherwise, the multiverse argument would not even exist.

    • CatherineGiordano profile imageAUTHOR

      Catherine Giordano 

      2 years ago from Orlando Florida

      Brother Christrophe: Evolution does not make things perfect. It makes them "good enough " All living things have "defenses"; anything that didn't would go immediately extinct. I suggest a humble reading of a text book on evolution.

    • profile image


      2 years ago

      I agree…a third hand would have been quite useful when I was harvesting black currants last summer. Likewise, just think how helpful it would be to have eight eyes like the jumping spider. My guess is that it was a balancing job on the part of God…to make it useful, yes, but would it be beautiful? He’s the supreme Artist. Then, how does one explain the thorns and thistles along our path? A humble reading of the first chapters of Genesis makes life much more sensible. Good day…

    • CatherineGiordano profile imageAUTHOR

      Catherine Giordano 

      2 years ago from Orlando Florida

      Yvonne: Thanks for your comment. I agree than mankind has invented gods. And it is the height of egotism to think that we humans are the center of the universe, the very reason for the universe.

    • profile image

      Yvonne, I.M.M. Weekers 

      2 years ago

      Anthropocentrism is the invention of homosapien: Only humans (homo sapiens )can invent and explain such a theory: If the universe and creation has had another algorithm the whole theory of relious homomsapiens and creationists shoud be fallen down. I think intelligence is the whole of the sample of the creation (universe), where homo sapiens is only a part of . Example: Only a men can say: behave to men as if they were gods.

    • CatherineGiordano profile imageAUTHOR

      Catherine Giordano 

      2 years ago from Orlando Florida

      Patty Russel: Thank you for letting me know you liked it. And thank you for sharing. The puddle analogy does a great job of spoofing the fine-tuning concept.

    • profile image

      Patty Russell 

      2 years ago

      I enjoyed your article very much and will share the link. Thank you for including the "puddle analogy".

    • CatherineGiordano profile imageAUTHOR

      Catherine Giordano 

      2 years ago from Orlando Florida

      Antoine: Thanks for letting me know you liked it. A share is the best compliment I can get.

    • profile image


      2 years ago

      Bravo. Very concise and well put! Already shared many times..

    • CatherineGiordano profile imageAUTHOR

      Catherine Giordano 

      2 years ago from Orlando Florida

      Thanks for letting me know you liked it. Researching it and writing it was a challenge to my own brain gears.

    • Fullerman5000 profile image

      Ryan Fuller 

      2 years ago from Louisiana, USA

      This article definitely gets the brain gears going. Truly in-depth article with lots to think about. Interesting as well.

    • CatherineGiordano profile imageAUTHOR

      Catherine Giordano 

      2 years ago from Orlando Florida

      LarryRankin: I'm glad you enjoyed it.

    • Larry Rankin profile image

      Larry Rankin 

      2 years ago from Oklahoma

      Interesting perspective.

    • CatherineGiordano profile imageAUTHOR

      Catherine Giordano 

      2 years ago from Orlando Florida

      Duane Townsend: Thanks for letting me know you liked it. After you have had a chance to read it, let me know your thoughts.

    • CatherineGiordano profile imageAUTHOR

      Catherine Giordano 

      2 years ago from Orlando Florida

      Ericdieker: Thanks for letting me know you liked it.

    • Ericdierker profile image

      Eric Dierker 

      2 years ago from Spring Valley, CA. U.S.A.

      Really cool. I thank you for sharing your ideas with me.

    • CatherineGiordano profile imageAUTHOR

      Catherine Giordano 

      2 years ago from Orlando Florida

      annart: I know how you feel. I immersed myself in this cosmology stuff and my head may never stop spinning. I'm glad you asked about the soul. It just so happens I have two essays about the soul, and I hope they will give you something more to think about. They are "What Is the Soul?" and "Does the Soul Exist?" Thank you for your comment. I'm so glad that you enjoyed reading my essay. I'll put the links to my soul essays here:

    • Duane Townsend profile image

      Duane Townsend 

      2 years ago from Detroit

      Catherine your questions are exquisite!

      I haven't thoroughly read this Hub yet but your questions made me stash this to read later.

    • annart profile image

      Ann Carr 

      2 years ago from SW England

      Wow Catherine! You've given me so much information and science that my mind is whirling with thoughts and counter-thoughts! Superbly presented, as always, and I'm only just catching up on some of your work again.

      Your quotes are interesting. I was brought up a Christian and the difficulty I have is that 'the soul' seems to exist and so far no one has come up with a suitable explanation of that. How has the universe created the soul?

      I have many dilemmas regarding this subject but I appreciate you setting out the evidence as you've found it. A super hub indeed.


    • CatherineGiordano profile imageAUTHOR

      Catherine Giordano 

      2 years ago from Orlando Florida

      Hari Prasad S: Thanks for letting me know that you liked my essay.

    • CatherineGiordano profile imageAUTHOR

      Catherine Giordano 

      2 years ago from Orlando Florida

      FlourishAnyway: Thanks for your comment. Like you, I don't think humans are the purpose of the universe. However, if you do a google search for "fined-tuned universe," you will find many more web pages promoting the idea that it is than web pages who give our viewpoint. Douglas Adams is a humorist not a scientist or a theologian, but the apologists seem to devote a lot of energy to trying to take him down for his puddle analogy.

    • CatherineGiordano profile imageAUTHOR

      Catherine Giordano 

      2 years ago from Orlando Florida

      Cyndi10: Just in our universe (never mind the multiverse) there are so many billions of galaxies, stars, and planets, it seems unlikely that Earth can be the only planet with intelligent life. Maybe humanoid life is where evolution eventually gets to because it is the best suited for survival. On the other hand, maybe Earth did win the lottery. A lot of thing had to happen exactly like they did (like a meteor wiping out the dinosaurs) to result in us.

    • Cyndi10 profile image

      Cynthia B Turner 

      2 years ago from Georgia

      Thanks for all those theories. It's all rather fantastical that we are here. And if there are so many other universes with planets very much like earth, does that mean there are also species very much like our own here or did we just get lucky and win the lottery of creation and existence? Now that you have brought it to my attention, I'll have to read the Grand Design. The unfortunate byproducts of the questions and theories are the headaches!:-) Take care.

    • shprd74 profile image

      Hari Prasad S 

      2 years ago from Bangalore


      - hari

    • FlourishAnyway profile image


      2 years ago from USA

      I've never thought we were the purpose for any of the universe. I have enjoyed reading your perspective. Lots of deep thought here.


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