Tag Archive for: Jonathan McLatchie

The Argument From Cosmic Fine Tuning

The Argument From Cosmic Fine Tuning

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The concept of cosmic fine tuning relates to a unique property of our universe whereby the physical constants and laws are observed to be balanced on a ‘razor’s edge’ for permitting the emergence of complex life. The degree to which the constants of physics must match precise criteria is such that a number of agnostic scientists have concluded that indeed there is some sort of transcendent purpose behind the cosmic arena. British astrophysicist Fred Hoyle writes: “A common sense interpretation of the facts suggests that a superintellect has monkeyed with physics, as well as with chemistry and biology and that there are no blind forces worth speaking about in nature. The numbers one calculates from the facts seem to me so overwhelming as to put this conclusion almost beyond question.”

Fundamental Constants

The ripples in the universe left over from the original ‘Big Bang’ singularity (often referred to as CMB, or cosmic background radiation) are detectable at one part in 10^5 (100,000). If this factor were even slightly smaller, the cosmos would exist exclusively as a collection of gas — stars, planets, and galaxies would not exist. Conversely, if this factor were increased slightly, the universe would consist only of large black holes. Either way, the universe would be uninhabitable.

Another finely tuned value is the strong nuclear force that holds atoms — and therefore matter — together. The sun derives its ‘fuel’ from fusing hydrogen atoms together. When two hydrogen atoms fuse, 0.7% of the mass of the hydrogen atoms is converted into energy. If the amount of matter converted were slightly smaller — say, 0.6% instead of 0.7% — a proton would not be able to bond to a neutron and the universe would consist only of hydrogen. Without the presence of heavy elements, planets would not form and hence no life would be possible. Conversely, if the amount of matter converted were increased to 0.8% instead of 0.7%, fusion would occur so rapidly that no hydrogen would remain. Again, the result would be no planets, no solar systems and hence no life.

The ratio of electrons to protons must be finely balanced to a degree of one part in 10^37. If this fundamental constant were to be any larger or smaller than this, the electromagnetism would dominate gravity — preventing the formation of galaxies, stars, and planets. Again, life would not be possible.

The ratio of the electromagnetic force to gravity must be finely balanced to a degree of one part in 10^40. If this value were to be increased slightly, all stars would be at least 40% more massive than our Sun. This would mean that stellar burning would be too brief and too uneven to support complex life. If this value were to be decreased slightly, all stars would be at least 20% less massive than the sun. This would render them incapable of producing heavy elements.

The rate at which the universe expands must be finely tuned to one part in 10^55. If the universe expanded too fast, the matter would expand too quickly for the formation of stars, planets, and galaxies. If the universe expanded too slowly, the universe would quickly collapse — before the formation of stars.

The mass density of the universe is finely balanced to permit life to a degree of one part in 10^59. If the universe were slightly more massive, an overabundance of deuterium from the big bang would cause stars to burn too rapidly for the formation of complex life. If the universe were slightly less massive, an insufficiency of helium would result in a shortage of the heavy elements — again, resulting in no life.

Mass of the Cosmos

The density of protons and neutrons in the cosmos relates to the cosmic mass density. That density determines just how much hydrogen fuses into heavier elements during the first few moments after the origin of the universe. In turn, the amount of heavier elements determines how much additional heavy-element production occurs later in the nuclear furnaces of stars.

What would be the consequence if the respective density of neutrons and protons were significantly lower? Firstly, nuclear fusion would occur with less efficiency. Consequently, the heavier elements such as carbon, nitrogen, oxygen, phosphorous, sodium and potassium — all of which are essential for the emergence of physical life — would not be formed. Moreover, assuming no additional cosmic density factors such as dark energy, a cosmos which possesses less mass density would prohibit the formation of stars and planets. Why? The expansion rate would be so big that matter would expand too quickly for gravity to pull together the gas and dust to allow their formation. If that were not enough, with only a little extra mass, the cosmos would expand so slowly that all stars in the cosmos would quickly turn into black holes and neutron stars. The density near the surface of such bodies would be so enormous that molecules would be impossible. Therefore, life would not be possible. The radiation from the formed black holes and neutron stars would also render physical life an impossibility at any point in a universe with such a high density.

Conversely, what would be the effect if the density of protons and neutrons in the cosmos were to be significantly higher? Nuclear fusion would be too productive, meaning that all the hydrogen in the universe would rapidly fuse into elements heavier than iron. The ultimate result is the same — the life-essential elements would not exist. Moreover, if the cosmic mass density were to be greater, gas and dust would condense so effectively under gravity’s influence that all stars would be much more massive than the Sun. Thus, planets would not be life-permitting because of the intensity of the radiation of their respective star, and additionally because of the rapid changes in the stars’ temperature and radiation.

The mass of the universe exhibits cosmic fine-tuning to simultaneously permit two features which are essential for permitting life: (1) the correct diversity and quantity of elements; and (2) the appropriate rate of cosmic expansion required to allow life. Such cosmic fine-tuning bespeaks foresight and planning — indicators of intelligent design.

Our Place in the Universe

There exist many physical factors that must be precisely set for any planet to be hospitable to life. Life must be in the right type of galaxy. There are three types of galaxies (elliptical, irregular and spiral). Elliptical galaxies lack the heavy elements needed to support life. Irregular galaxies have too many supernova explosions. Only spiral galaxies can foster life. The Milky Way is a spiral galaxy.

Life must also be in the right location in the galaxy. We are situated in the right place in the Milky Way. If we were too close to the center of the galaxy (closer to the black hole), harmful radiation would make life impossible. Conversely, if our planet was too far out in the periphery, not enough heavy elements would be available for the construction of habitable planets.

Life must also have the right type of star. Stars act as energy sources for life. Most stars are too large, too bright or too unstable to support life. The size and age of the sun enhance the earth’s hospitality. If the earth were moved 1% closer to the sun, bodies of water would vaporize, and life would not be possible. If the earth were as much as 2% farther from the sun, its waters would freeze. Earth has a nearly circular orbit, which ensures a nearly constant distance from the sun — ensuring that seasonal changes are not too severe.

The other planets in our solar system contribute greatly to the earth’s habitability. For example, the massive gas giant Jupiter acts as a cosmic vacuum cleaner, protecting the earth from incoming comets. Likewise, Mars protects the earth from incoming asteroids.

If the earth did not have a moon of the right shape and size, our planet would not be able to sustain life. The moon stabilizes the earth’s tilt, in turn preventing extreme temperatures and creating a stable, bio-friendly environment.

There are many other factors which influence the habitability of the earth. The few examples here detailed unequivocally demonstrate that indeed the earth is a privileged planet, another indicator of intelligent design.

Is the Universe Designed for Discovery?

In 2004, Guillermo Gonzalez and Jay Richards published their groundbreaking book, “The Privileged Planet”, in which they argued that the conditions most suited for life also provided the best overall setting for making scientific discoveries. In other words, our planet is not merely fine-tuned for life, but it is also finely-tuned for discovery.

One example is the phenomenon known as solar eclipses. People have witnessed solar eclipses for millennia, but only recently have we begun to notice a remarkable correlation: The only place in our solar system where a perfect solar eclipse can be observed happens to be the only place where there are observers. There are hundreds of moons in our solar system, but most moons cannot entirely eclipse the sun. Of all the places in our solar system, only on earth do the sun and moon appear the same size to observers. This is because the sun is approximately 400 times larger than the moon and roughly 400 times farther away. Solar eclipses have played a significant role in scientific discovery, having helped physicists to confirm Einstein’s general theory of relativity.

The Milky Way, as a spiral galaxy — in addition to being the only biofriendly kind of galaxy — is relatively flat. Consequently, it has less gas and dust than others, and fewer stars impede our view of the rest of the universe.

Earth is located not only in the galactic habitable zone but also in the right place where minimal light pollution and other visual obstructions might impede the view of our surroundings. Moreover, earth’s atmosphere — which is the only one we know of which can support life — is also the only one clear enough to allow us to observe the universe.

Such findings place naturalists (who see us and our place in the cosmos as nothing more than accidents) in an uncomfortable position. But it makes a lot of sense to theists, who see us and our place in the cosmos as fully intended by an intelligent creator.

Conclusion

To believe that the facts and figures here detailed amount to no more than happy coincidence, without doubt, constitutes a greater exercise of faith than that of the Christian who affirms the theistic design of the universe. Such scientific insights over the last several decades have led the late Robert Jastrow — a self-proclaimed agnostic — to write: “For the scientist who has lived by his faith in the power of reason, the story ends like a bad dream. He has scaled the mountains of ignorance; he is about to conquer the highest peak; as he pulls himself over the final rock, he is greeted by a band of theologians who have been sitting there for centuries.”

This blog post was adapted from a previous article published on AllAboutScience.org.

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Did They Really Exist? A Biblical and Scientific Defence of Adam and Eve

Did They Really Exist? A Biblical and Scientific Defence of Adam and Eve

The historicity of Adam and Eve is a question which strikes at the heart of the Christian faith. If the primordial pair did not exist, then the historical and Biblical doctrine of the fall becomes extremely difficult to maintain. The apostle Paul clearly linked God’s redemptive plan and Christ’s atonement for sin with the fall described in Genesis (e.g., see Romans 5:12-21). We read in Romans 5:12-14,

 

12 Therefore, just as sin entered the world through one man, and death through sin, and in this way death came to all people, because all sinned— 13 To be sure, sin was in the world before the law was given, but sin is not charged against anyone’s account where there is no law. 14 Nevertheless, death reigned from the time of Adam to the time of Moses, even over those who did not sin by breaking a command, as did Adam, who is a pattern of the one to come.

In 1 Corinthians 15:20-22, we similarly read,

20 But Christ has indeed been raised from the dead, the firstfruits of those who have fallen asleep. 21 For since death came through a man, the resurrection of the dead comes also through a man. 22 For as in Adam all die, so in Christ all will be made alive.

Further evidence that Paul took Adam as a literal historical figure can be found in 1 Timothy 2:11-14 where he appeals to this doctrine in order to make an argument concerning the role of women in the church with respect to men. Paul writes,

11 A woman should learn in quietness and full submission. 12 I do not permit a woman to teach or to assume authority over a man; she must be quiet. 13 For Adam was formed first, then Eve. 14 And Adam was not the one deceived; it was the woman who was deceived and became a sinner.

Indeed, Jesus Himself clearly understood Adam and Eve to have been historical figures. In response to questioning from the Pharisees about marriage and divorce, Jesus declared (Matthew 19:4-6),

4 “Haven’t you read,” he replied, “that at the beginning the Creator ‘made them male and female,’ 5 and said, ‘For this reason a man will leave his father and mother and be united to his wife, and the two will become one flesh’? 6 So they are no longer two, but one flesh. Therefore what God has joined together, let no one separate.”

As if that wasn’t enough, the genealogies recorded in 1 Chronicles 1 and Luke 3 treat Adam as a historical figure. The literature associated with second temple Judaism also recognized Adam as a historical individual. The context and genre of the book of Genesis does not give any indication whatsoever that it is intended to be non-literal or ahistorical in the sense that much of apocalyptic literature (e.g., the book of Revelation) is. If we read the book of Genesis as metaphorical, at which point do we stop? The life of Abraham (to whom we are first introduced in Genesis 12) is clearly connected to the history that came before him, going all the way back to Adam. Those who discard Genesis 1-11 as metaphorical but understand Genesis 12 onwards to be historical are being inconsistent. The narrative simply does not allow for this interpretation.

Christians may have disagreements about peripheral matters such as the age of the earth. As I have discussed before, I don’t think that Genesis commits one to accepting a young earth position. However, the historical existence of Adam and Eve is another matter — it is a Gospel issue. Without a historical Adam and Eve, and without a historical fall, the doctrine of the atonement and redemption makes very little sense.

Having presented some Biblical reasons for thinking that Adam and Eve were literal historical individuals, I want to turn my attention to some of the common scientific arguments which are advanced against the notion of a historical Adam and Eve.

Minimum Effective Population Size

It is argued by many that coalescence theory and analysis of single nucleotide polymorphisms/linkage disequilibrium (SNP/LD) show that the mean effective population size for the hominid lineage is 100,000 individuals over the course of the last 30 million years. According to some theories, a genetic bottleneck occurred in the hominid lineage during the Middle Pleistocene with, according to one recent study, a mean effective population size of only 14,000 individuals. A range of values for the most recent common ancestor (TMRCA) is given as “450,000-2,400,000 years for the autosomes, and 380,000-2,000,000 for the X chromosome,” (Blum and Jakobsson, 2011).

The trouble with such attempts to estimate the effective population size and times of most recent common ancestors is the number of simplifying assumptions which are involved in the calculation. These include:

  • Fixed population size.
  • No migration.
  • Random mating.
  • Non-overlapping generations.
  • Constant mutation rates.
  • No selection.

The problem is that human populations change in size, migration in and out of the population does occur, humans selectively mate, mutation rates are often not constant, and selection does occur. Indeed, rates of recombination are also known to differ with respect to a location on the chromosome. Attempts at estimating effective population sizes and coalescent times, therefore, are rendered difficult by their high dependency on the assumptions made and the constancy of the pertinent variables. This makes it extremely hard to make dogmatic claims in this regard.

Let’s take an example to illustrate this point. One research paper examined 377 short tandem repeat (STR) loci pertinent to 1,056 individuals from 52 different populations (Zhivotovsky et al., 2003). The study inferred that modern humanity arose from a common ancestral population living between 71 and 142 thousand years ago from a relatively small population size (less than 2000 individuals). A previous study estimated this ancestral population size to be comprised roughly of 500 individuals (Zhivotovsky et al., 2000). This non-congruity was apparently resultant from the use of varying number of loci by the two studies as well as use of different sample sizes.

The Y-Chromosomal Adam Paradox

It is widely known that molecular dating based on the male-specific Y-chromosomal DNA tends to give somewhat more recent dates for the most recent common ancestors of modern humans than does molecular dating based on the maternally inherited mitochondrial DNA. This has been argued by some to show that Adam and Eve lived tends of thousands of years apart from one another. Though there are obviously alternative explanations for this phenomenon, one interesting hypothesis relates to the genetic bottleneck pertinent to the great flood described in Genesis. In that case, the most recent male common ancestor would be Noah (Noah’s three sons Shem, Ham, and Japheth, boarded the ark along with their respective wives). The most recent female common ancestor, however, would be Eve. This would quite readily account for the discrepancy between the data yielded from the Y-chromosomal and mitochondrial DNA sequences.

Where Did Cain Get His Wife?

The first thing to take notice of is that Adam and Eve had other sons and daughters besides Cain, Abel, and Seth. According to Genesis 5:4, “After Seth was born, Adam lived 800 years and had other sons and daughters.” It is also noteworthy that Genesis 5 records very long life spans, with people living up to an age of 900 years. Given this, Dr. Hugh Ross argues that “the possibility existed for a veritable population explosion. In fact, the world’s population could have approached a few billion by the time of Adam’s death at the age of 930.” There is some Biblical support for thinking that there was a reasonable population size following Cain’s murder of Abel. According to Genesis 4, Cain is given a mark “so that no one who found him would kill him.” This presupposes that there was a population size sufficient such that (a) there were people who might find Cain in the wilderness, and (b) Cain might be mistaken for someone else.

The possibility that Cain may have married his sister raises the old question of incest. It is not until the book of Leviticus, however, that laws are given against marriage between siblings. Adam and Eve were probably created genetically pure. It is, therefore, likely that the genetic defects resulting from the marriage between siblings would not present an issue for the first couple of dozen generations.

Summary and Conclusion

In conclusion, attempts to estimate coalescent times and effective population sizes are fraught with problems and require that we make a number of unrealistic assumptions. Perhaps it is possible that some of these estimates pertain to the human population sometime after the creation of Adam and Eve. The question of Cain’s wife is effectively resolved if we suppose that genetic defects resulting from the marriage between siblings was a later development. The existence of a historical Adam and Eve, however, is foundational to a full and proper understanding of the Gospel and Christ’s role as the “second Adam.” “For as in Adam all die, so in Christ, all will be made alive,” (1 Corinthians 15:22).

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