God and the History of the Universe
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Some Christian understandings of reality do conflict with some scientific understandings. But a thoroughly rational Christian understanding of the origin and history of the universe will be informed by the best scientific theories and the "facts" founded on them.
This book weaves a narrative of the origin and history of the universe from the perspective of contemporary science with a Christian understanding of God and of God's role in the origin and history of the universe.
At the center of this integrated narrative is the view that God, who is pure, unbounded Love, is Creator: the zest for life in the universe comes from God, and God is the source of Truth, Beauty, and Goodness in the universe.
God is amazed and delighted at what God-and-the-world has created; God is saddened by ways creatures have fallen short of pure, unbounded Love, Truth, Beauty, and Goodness; and God's pure, unbounded Love keeps on trying to persuade all creatures toward Truth, Beauty, and Goodness.
Jarvis Streeter
Jarvis Streeter, Professor of Religion at California Lutheran University from 1988 to 2013, received awards for his teaching in 1991 and 2004 and a posthumous Honorary Alumnus of the Year award. He is the author of Human Nature, Human Evil, and Religion (2009). Streeter completed his work on this book by mid-2013, six months before his death from pancreatic cancer.
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God and the History of the Universe - Jarvis Streeter
1
Worldviews
Everyone has a worldview. A worldview is the idea you have of the way things are, a conception of what reality is like. For most of us, this worldview is informal. We have some basic ideas about the nature of reality but have not attempted to define them more precisely, nor considered carefully whether this collection of beliefs holds together logically, nor evaluated its adequacy in comparison to the knowledge, experiences, and differing worldviews of others. Instead, our worldviews tend to be somewhat amorphous, floating, as it were, in the background of our minds, yet constituting the mental framework within which we live and interpret what we experience throughout our lives. It is the rare person—generally someone more academically- or theoretically-minded—who seeks to make his or her worldview explicit, to express it clearly, and to test it for internal coherence and compatibility with a broad range of human knowledge and experience. The primary aim of this book is the explication of such a formal type of worldview, one that is both scientific and Christian.
Our worldviews are built up from our knowledge and beliefs. Conceived simply, knowledge is made up of the accumulation of facts, which may be defined as what any rational human being must accept as true about the world, assuming his or her senses and mind are functioning properly. Beliefs, on the other hand, are based upon our interpretations of facts—how we put together the facts that we know in order to come up with more general ideas about the way things are.
Worldviews, then, are systems of belief built up from our interpretations of the facts we have encountered through our experiences in life. The ideal way to construct the best possible worldview would logically be to learn all the facts about reality and then interpret them in their interrelations with one another in a fully objective and rational way. This would result in a fully comprehensive and coherent understanding of reality. As such, all knowledgeable and rational people would find it credible and persuasive.
It is obvious, though, that we do not all share the same worldview. We hold a considerable variety of profoundly conflicting worldviews, and the reasons for this are not difficult to discern. Indeed, a widespread consensus has developed in recent decades among neuroscientists, psychologists, sociologists, philosophers, and others as to why we hold the views we do, as well as why changing them seems so difficult for us.¹
In the first place, none of us comes to the process of worldview construction without some understanding of reality already in place. This initial understanding is a product of our earliest experiences as children. Even as infants, we already form some rudimentary sense of what the world is like—more felt than thought—based on our experiences of ourselves and those around us, particularly our parents or other primary caregivers. We quickly learn that we are in control neither of our own bodies nor of our surroundings, and so must rely on others to provide us with what we need to survive. This makes us feel anxious and insecure. Our anxiety will decrease to the degree that those around us provide for our physical and emotional needs, or it will intensify to the degree that they do not. As a result, our earliest felt worldview is of reality as generally supportive, relatively benign, or largely hostile to ourselves.
As our mental abilities develop and we progress through childhood, we gradually form a conceptual worldview, most of which we learn from others, rather than create by ourselves. This occurs because of what we term the socialization process, in which we learn as children how to function in the particular familial and cultural world(s) we inhabit. This socialization includes learning how to view the world and behave in it from those around us, especially our parents or primary caregivers, others in our immediate family, and those with whom we have frequent and intimate contact. This cultural indoctrination
is both intentional, through specific teaching by those around us, and unintentional, based on our observations of what these others say and how they behave—including when they say one thing and do another.
Our first conceptual worldview is thus largely that of those closest to us, whose views we typically believe to be true without it ever occurring to us to question them. We assume that what they believe is the way things are, and that everyone shares this understanding of the world and how to behave in it. This impression is heightened to the degree that others with whom we have contact reinforce that understanding of reality; and, since most people tend to associate with others who are largely like themselves—belonging to the same ethnic, religious, socio-economic, and other such groups—our parents’ worldview is typically reinforced throughout our formative years. In this way, each of us emerges from childhood with a very specific worldview, one that differs from others who have been raised by different parents and are not part of the social groups to which we belong.
A second reason our worldviews differ so greatly from one another concerns the body of facts we come to know over the course of our lives. Most of us recognize that every one of us has a unique set of experiences in life and so learns a body of facts different to a greater or lesser degree from those of other people. This means that each of us will have greater knowledge in some areas than in others. Thus, scientists in a particular field, say geology, will know more about geology and about science in general than most nonscientists, and Christian theologians will know more about theology and Christian studies in general than most non-theologians.
The point here is that nobody can possibly know in the short span of a human lifetime everything about everything. Since no two of us know exactly the same body of facts, and since our worldviews are largely determined by the facts we know, it is clear that no two worldviews will be identical. Those of us who would construct a more comprehensive worldview, therefore, will seek to learn from others more knowledgeable in areas in which we are less knowledgeable, in order to have the widest range of facts undergirding our perspectives.
The problem is that there is no such thing as a naked fact.
Every supposed fact
involves an unconscious interpretation of the data we received through our senses. For example, when you look at this page, what you actually see are patterns of black squiggles on a white background. It is only by an act of interpretation that your mind can determine the squiggles to be letters of the alphabet that, when grouped together, form words that we can read, and that have meaning. Wherever interpretation is involved, however, there is room for error. Even the way we interpret what seem to be simple sensory data is not always correct. A stick that is partially submerged in water appears to be bent, when it is not bent at all. The same is true of desert mirages, where the pavement ahead appears to be wet, even though it is not. Also, as most of us know, eyewitnesses to accidents are notorious for giving conflicting descriptions of the facts,
even though each of them based their description on sensory input that presumably accurately took in what transpired. This inherent layer of interpretation, in moving from what our senses perceive to what we interpret those perceptions to mean, only complicates further reaching a consensus on what the facts of reality are. That is one reason why people construct different, and even conflicting, worldviews.
Another problem related to facts is that most of the things we learn about the world are not things we ourselves have experienced but instead come to us from others, including supposed experts or authorities. The problem is that not all experts
are equally expert in any given field, and that even true experts do not always agree with one another on everything. Many supposed experts unintentionally teach incorrect facts.
Others, who are not really experts, teach us incorrect facts.
Still others intentionally lie to us, in order to manipulate us.
For example, I have heard pastors throughout my life teach that John the Baptist and Jesus were cousins, based on Luke 1:36. Actually, in the original Greek that verse does not say that John and Jesus were cousins (though the King James Version of 1611 did incorrectly translate it that way—just one example where even the Bible as translated into other languages can mislead us). The Greek word used to describe the relationship of Elizabeth, soon to give birth to John the Baptist, and Mary, soon to give birth to Jesus, is syngenis, meaning relative
or kinswoman,
which in the Jewish culture of the time could mean a member of one’s immediate or extended family, someone from the larger clan of which one’s family was a member, someone from the same large-scale tribe, or even simply any fellow Jew. Given the breadth of possible meanings, to say that John was Jesus’s cousin is a far more specific claim than the meaning of the word syngenis can support. The point here is that much of what we know
has come to us from others, including supposed authorities, and yet these people are not always correct in what they tell us. Unless we have investigated such facts
ourselves and confirmed their truth (as far as we are able to do so), we cannot be certain that the facts
we have learned are indeed facts.
Another problem regarding facts arises from the distinction between public and private facts. Some things, say the nature of leaves from a particular type of tree, are accessible to any of us whose senses and minds are functioning properly. It is therefore reasonable to believe that essentially all of us would agree on the basic facts concerning that leaf, including its basic color, shape, smell, texture, and the like. However, some facts, such as the unique personal experiences you have in life, including especially your mental and emotional experiences, are not like these publicly observable facts. Only you experience them. For the most part, they are unique and unrepeatable. You will accept such experiences as facts, though other people, having not had those same experiences, may not. This becomes particularly important for our discussion when considering, for example, religious experiences and their effect on a person’s worldview. All these considerations surrounding the notion of facts
demonstrate that even what we should consider as the proper body of facts to be interpreted in the process of forming a worldview can be quite problematic.
If determining the facts to be taken into account in constructing an understanding of reality is difficult, the process of rationally interpreting them in relation to each other is even more problematic. First, because we all begin with some worldview, the one learned as a child from our family and friends, we typically interpret our experiences from the perspective of that worldview, whether or not it is the best one to make sense of those experiences. This is why a person raised in a fundamentalist² Christian home will typically have much more difficulty accepting or even considering the possible truth of evolution than a person raised in a non-fundamentalist family. Similarly, a person raised in an atheistic family will typically find it more difficult to believe in the existence of God, or even to consider that possibility, than one reared in a religious home.
In addition, the correct or most logical interpretation of a body of facts is often far from obvious. The same facts can sometimes be reasonably interpreted in more than one way, generally due to the body of known facts being insufficient to decide between rival interpretations. As we will see later, this is a problem often encountered in both science and theology.
Another problem for properly interpreting a body of facts is that some of us have greater mental skills and/or training than others, and so are more able to think rationally about our beliefs. Others are simply not as well equipped for logical thought. I remember an evening where I was engaged in a public debate over evolution and Christian belief, and the discussion turned to the topic of biblical inerrancy, which is, in fact, what is finally at stake in the evolution debate. I argued against biblical inerrancy, to which a man in the audience responded that he could show me twenty passages in the Bible where evidence (from archaeology or other historical records from the time, for example) has confirmed the truth of what was said there, and that therefore the Bible was inerrant. I responded that I could show him a hundred such passages, but that just because a hundred passages were factually accurate did not necessarily mean that all the other passages in the Bible were as well. He argued that it did, failing to understand that he was committing the part-whole fallacy in logic and so was not thinking rationally.
Of course, part of his refusal to think rationally in this case may also have been because he, like most of us, did not want to be wrong. If this is true generally and with regard to minor things, it is even more the case with regard to our understandings of reality, which have been central to how we have understood ourselves and the world, and how we have acted throughout our lives. As a rule, the longer we have held our worldviews, the less likely we are to be open to changing them. Most of us will not change our understanding of reality unless a large body of evidence forces us to change—and even then, some of us will not do so, simply refusing to acknowledge as factual the evidence that indicates the incorrectness of our beliefs. To have to admit to others and to ourselves that we have been wrong makes us feel diminished and vulnerable. It, therefore, lowers our sense of self-worth, our self-esteem. Typically, the more weak and threatened we feel in our lives, the more inflexible we will be in our beliefs and practices. Simply put, for many of us the need for self-esteem, for emotional well-being, trumps the desire to be rational. For some, it is a matter of emotional survival. In the end, most of us tend to believe what we want to believe, rather than what a rational, objective analysis of the facts would lead us to believe.
This underscores the important role psychological and sociological factors play in our ability not only to construct a rational worldview, but also to be open to modifying it in the light of new facts and experiences. These factors are several. We should consider them individually.
One factor is the nature of our genetic inheritance and, as just noted, our earliest childhood experiences with our parents or primary caregivers, and how they have affected us. If we have been gifted by nature in our physical, emotional, and intellectual makeup, and if our parents or caregivers were responsive and loving in caring for and socializing us, and if we have not suffered any or very many traumas in life, we will tend to be less defensive and so more open to new ideas. Conversely, the less gifted we are biologically, the more trauma we have experienced as children and throughout our lives, and the less loving and attentive our parents or caregivers were to us when we were young, the more defensive and rigid, and therefore less rational and open to new ideas, we will tend to be. Defensiveness regarding our worldviews can even lead the weaker among us to ridicule others for believing differently. That seems like a desperate attempt to try to shore up one’s own worldview.
Another factor shaping our rationality and our openness and ability to modify our worldviews will be the kinds of general experiences we have had throughout our adolescent and adult lives and how we have responded to them. Some experiences, such as being friends with those who have other worldviews, might prompt us to rethink aspects of our worldviews, assuming we do not feel too threatened by them to do so. However, if we have led sheltered lives or have tended to respond negatively to new experiences and ideas generally, we will tend to maintain our present worldviews, and perhaps become even more firmly entrenched in them, when we encounter other viewpoints.
Still another factor influencing how open and rational we might be in rethinking our worldviews based on our continuing experiences in life is the nature of the worldview we learned as a child. If it was one that was positive about other people and groups and inclined us to seek new experiences and appreciate ways of living in and viewing the world other than our own, we will tend to be more open and rational in considering the strengths and weaknesses of our own culture and worldviews. On the other hand, if we have been taught not to trust others or to consider the possible truth of any views that deviate from our own, we will tend to cling to our worldviews, whether it is reasonable to do so or not.
Yet another factor influencing our openness to modifying our worldviews is the influence of the people with whom we associate throughout our lives, especially those closest to us and from whom we derive emotional and perhaps even physical and/or financial support. Such people will tend to have a profound influence in shaping what we believe. Peer pressure, to cite one example, is a powerful factor in shaping our beliefs, with its power over us proportional to our insecurity. It takes courage and strength to deviate from the group’s way of seeing and doing things and stand alone with our own convictions. Whereas earlier in human history, standing alone threatened one’s physical survival, today—at least in much of the so-called developed world
—the threat is more often to our emotional survival. This emotional component of survival is hardly trivial. We can die, even take our own lives, when the emotional blows become too much to bear. It should come as no surprise, then, that our tendency is to conform to the views and behaviors of the groups into which we were born and socialized, and to hold the views of the groups of which we are a part throughout our lives. Again, the weakest, most insecure of us will be most inclined to such behavior.
Finally, we must also note the fallibility of memory, which plays an important role in worldview formation and maintenance. As we have seen, our understanding of the nature of reality is built up from our interpretations of the facts we know based on our experiences, including those things we learn from others. Putting together all these facts is heavily dependent on our accurate memory of them—and contemporary neuroscience has demonstrated just how unreliable our memories can be. Study after study has confirmed that we often do not remember things accurately, shaping them instead according to our personal desires and needs—and all of this without our ever consciously realizing it. Thus, the fallibility of our memories is another problem in attempting to construct rational worldviews.
All of these factors, and perhaps still others, interact in complex ways unique to each of us, so that as individuals we exist somewhere along a spectrum ranging from more closed and dogmatic to more open and rational with regard to life and the worldviews we hold. From the perspective of creating a rational and comprehensive worldview, it is clear, then, that some of us will be more able, and others less able, to do so. We all start with some worldview born of our childhood experiences and training. The issue is whether we tend to cling irrationally to this worldview no matter what we experience subsequently, or are open to altering that initial view in light of new facts and experiences. If our tendency is toward the latter position, we clearly stand a much greater chance of viewing reality more the way it actually is than as we would like it to be.
It does seem that most of us, in fact, do modify our childhood worldviews to some extent over the course of our lives. Reality has a way of upending some of our most cherished beliefs, forcing us to change at least some of our views, even if we would rather not change them. Change is difficult, though, as we have seen, because it is threatening, particularly for those who are insecure and anxious. Changing our minds confronts us with our own fallibility and the fact that we do not really know—and, indeed, can never know—the truth about existence. This awareness can in turn undercut our confidence in ourselves and the meaning of our lives, which is also anxiety- producing and a threat to our emotional survival. It is, therefore, no wonder that most of us continue to conform to the major features of the worldviews we have been taught, and live within them throughout our lives, rather than seriously entertaining the risky possibility that another person’s (or group’s) views might be correct. It is easier, and safer, to stay where we are, to continue believing what we already believe, changing only when and if something absolutely forces us to change. This means that a rational worldview is a hard-won achievement for most of us and nearly impossible for others.
Types of Worldviews:Religious and Non-Religious
Perhaps the most fundamental distinction between types of worldviews is whether they are religious or nonreligious (or spiritual or non-spiritual).³ The basic issue here, in my understanding of the essential nature of religion (or spirituality), is whether one believes another aspect or dimension to reality exists in addition to the physical one we experience through our five senses. The nonreligious person, or materialist, denies that anything else exists in addition to the physical universe; the religious person believes there is also something else, another realm or dimension of existence, in addition to the physical one, that we may term spiritual reality. Important here is the recognition that both religious and nonreligious worldviews, like all worldviews, are belief systems, based on interpretations of the facts available to us. As such, we cannot prove or disprove either view. We can only argue each view based on logic and the available evidence. Nonreligious (or non-spiritual
) persons believe that the facts they know indicate that no such spiritual reality exists, while religious (or spiritual
) persons believe that the facts they know indicate that it does exist. People who believe that a spiritual reality exists and is personal are termed theists (ones who believe in God or gods); those who believe in a spiritual reality that is impersonal are generally called non-theists; those who deny the existence of God or gods are called atheists; and those who neither believe nor disbelieve in God or gods or any spiritual reality are termed agnostics.
How then might we judge rationally which among these competing worldviews—and, in some cases, within each type of worldview as well—has the greater claim to be the closest to a true description of reality? This is the heart of the problem, because, as we have seen, not all of us will agree either on what the relevant set of facts is or on what the most rational interpretation of those facts is, and this typically for the reasons we have cited above. Thus, regarding the issue of what constitutes a genuine fact, materialists typically claim that the only data that could possibly be considered factual are those that are empirical and scientifically testable, and that anything not available to public scrutiny, such as personal spiritual experiences, is automatically disqualified as potentially factual. This view has been termed scientism.
On the other hand, some conservative Christians, such as fundamentalists, will insist that the only certain facts are those found in the Bible, read literally, and therefore any data from science or any other source is to be considered factual only insofar as it agrees with what the Bible says—as they interpret it. This view has been termed biblicism. Interestingly, even though materialists and biblicists stand at opposite ends of the religious belief spectrum, both assert essentially the same thing: that any data are to be excluded from consideration as potentially factual if they do not fit their preconceptions about what can count as a fact. Because it is the interpretation of facts that lies at the heart of worldviews, prejudging what one will consider as potentially factual obviously means prejudging what might be a possibly true worldview.
Such prejudging does not seem a rational way to construct a worldview. We cannot justly prejudge what the facts upon which to build our worldviews are without having examined them. Rather, to construct the most adequate worldview, we should evaluate all possible data—whether from science, religion, or any other source—on their own merits as to their factuality. As we have already noted, the most adequate worldview will be the one that includes the broadest range of factual data, whether scientific, religious, personal, or otherwise, and interprets those data in the most reasonable way. The broader the range of facts a worldview accounts for—that is, the more comprehensive the fact-set incorporated—the more adequate the resulting understanding of reality should be. The fundamental difficulty in the religious versus nonreligious worldview debate, even among open-minded people, will, of course, be agreeing on what the facts actually are.
In addition to the comprehensiveness of the fact-set, another general determinant in evaluating any worldview will be, as we have seen, the adequacy of its interpretation of that fact-set. Here an essential criterion is a worldview’s internal coherence—whether its interpretation of the facts is such that each fact fits together with all other facts to produce a worldview in which there are no logical contradictions. A third criterion for evaluating worldviews is clarity, or the degree to which the worldview is clear in what it claims and is understandable to those who encounter it.
Several disqualifying criteria argue against the plausibility of the worldview. One important such criterion is the use of ad hoc solutions⁴ to problems within the system. In the next chapter is a scientific example of this in the discussion of the geocentric versus heliocentric cosmologies, where more circles were gratuitously added to the existing circular orbits of the planets in the geocentric understanding in order to defend the view in the face of significant evidence against it. In chapter 3 is a theological example of this in the way various ad hoc arguments have been used in an attempt to defend the doctrine of biblical inerrancy in the face of a good deal of biblical evidence against it.
Adherence to these criteria—a comprehensive fact-set with an internally coherent interpretation of those facts and a clear explanation of the worldview without resort to ad hoc additions to prop up the system’s weaknesses—does not guarantee that a given worldview will be true. Nevertheless, it does at least provide a foundation from which to begin to evaluate rival worldviews and to expose the inadequacy of any worldview that fails to fulfill them.
As I have said, the worldview presented in this book is both scientific and Christian. It seeks to combine what most scientists take to be the well-founded theories/beliefs of science with what I consider to be the well-founded theories/beliefs of Christianity into a single comprehensive, coherent, and clearly presented worldview. The strength of this approach, in my view, is that it does not prejudge what kinds of truth claims will be evaluated. It attempts to take the perspectives of both science and religion seriously, to evaluate the rationality of the facts and theories they assert, and then to construct an understanding of reality based on what seem to be the best and most relevant facts and theories of both.
The first thing we must do in seeking to accomplish this task is to look at the ways scientists and theologians determine what they believe. This means taking a close look at the methods of each discipline, their strengths and weaknesses, as well as the ways in which scientists, theologians, and philosophers have historically viewed the relationship between the two disciplines. These are the topics to which we turn in the next two chapters.
1. Compare, for example, Newberg and Waldman, Born to Believe, esp. chs.
1
–
5
; Polanyi, Personal Knowledge; Streeter, Human Nature, chs.
1
–
2
,
4
–
5
.
2. Fundamentalism
is a term that originated within Christianity in the early twentieth century to designate those Christians who subscribed to the tenets taught in a series of pamphlets, collectively titled The Fundamentals. The writers of these pamphlets argued that one could be a real Christian only if one believed in biblical inerrancy (that there are no errors of any kind whatsoever in the Bible) and John Calvin’s sixteenth-century doctrine of salvation by penal substitution. According to this doctrine, Christ voluntarily suffered and died on the cross in our place, taking the punishment we deserved for our sins onto himself. In this way, Calvin said, we Christians can be saved—that is, we get to go to heaven when we die. Today fundamentalism
has a broader scope, referring generally to the belief by members of any religion in the literal inerrancy of their scriptures.
3. Recently, some have wanted to make a distinction between being religious and being spiritual. For them, being religious implies subscribing to the teachings and practices of a specific religion, whereas being spiritual means having one’s own ideas about the spiritual world and following one’s own spiritual practices.
4. Ad hoc solutions are those that do not arise out of the system—in this case, the worldview—itself. They are like bandages, with different types invented to deal with different problems with the system.
2
How Science Operates
Science and theology employ methods of discovery that are different in some key ways. And yet, they also share some similarities that often go unrecognized, as we will see in the next chapter. According to scientists and philosophers of science, the general form of the scientific method consists of several parts. It begins by moving from a question about some feature of nature to a hypothesis about it, and then to experimental testing of that hypothesis. If repeated testing supports the hypothesis (or does not falsify it), scientists create a theory to explain why this aspect of nature is the way it is and, perhaps, even how it fits with other scientific theories into a comprehensive understanding of nature. Scientists concerned with the same or similar questions test this proposed theory, ideally based on the empirical predictions that the theory makes. Should this subsequent experimentation continue to provide support for the theory, and should the theory seem the most likely explanation of the available facts recognized by the community of scientists working in that field, then that theory becomes widely held. If, over time, continued testing consistently supports (or fails to disprove) the theory, it eventually comes to be accepted as a law of nature.
What is crucial to recognize here is that this general method, contrary to the belief common to many nonscientists, does not lead to certain truth but only probable truth—even in the case of the so-called laws of nature. By its very nature, no scientific theory can ever be proven to be true. The reason is that proof and certain truth can be found only in the fields of mathematics and logic, since these fields are based on deduction from presumed true axioms or premises. If the axioms or premises are true, the new ideas deduced from them must be true, and so can be rightly said to be proven.
Neither science nor theology, however, works primarily by means of deduction—though deduction does play an important role in both fields. Rather, both science and theology are fundamentally fact-driven enterprises, in that they proceed by gathering up facts and then drawing what seem to be the most reasonable general conclusions that can be derived from those facts.⁵ The greater the amount of supporting evidence, combined with an absence of evidence refuting a scientific or theological theory, the stronger is the probability that the theory is true. Thus, few scientists, if any, would claim that what we believe to be true in most areas of science today is absolutely true. Truth is what scientists hope to attain, believing that they draw nearer to it over time by means of the increase of relevant data and the experimental falsification of incorrect theories. Thus, as theoretical physicist S. James Gates Jr. (1950–) put it, Science . . . is not about truths. It is about forming beliefs that are less false.
⁶ The same can be said of theology.
A simple hypothetical example can illustrate the process of theory formation in science. Suppose a botanist wanted to know how many petals are on the flowers of a particular species of daisy. She would likely begin by locating such a daisy and counting the number of petals on it. If she counts twenty-four petals on that daisy she may form the tentative hypothesis that all daisies of that species have twenty-four petals. To test her hypothesis, she counts another such daisy’s petals and again finds twenty-four. Does that prove that all daisies of that species have twenty-four petals? No, she knows only that the two daisies she has examined have twenty-four petals. However, she may now have slightly more confidence in her hypothesis that all daisies of this species have twenty-four petals.
To continue to test her hypothesis, she counts more daisies. She counts eight more and finds that each of them has twenty-four petals, just like the first two. Has she proven her hypothesis that all daisies of that species have twenty-four petals? No, but her hypothesis seems more probable now because she has counted more daisies (i.e., performed more experiments), and all of them have had the predicted number of petals. Therefore, she decides to test the hypothesis further, counts the petals on a thousand such daisies, and discovers that every one of them has twenty-four petals. Has she now proven her hypothesis that all daisies of that species have twenty-four petals? Still the answer must be no, and the reason is simple: she has not counted all the daisies of that species that exist. All it would take to demonstrate that her hypothesis was wrong would be to find a single daisy that had not been tampered with and that had fewer or more than twenty-four petals.⁷
What she can say is that her hypothesis is much more probable than it was before. Yet even if she were to find every such daisy on Earth and count the petals on them all, and in every case find that there were twenty-four petals, she still would not have proven that all daisies of that species have twenty-four petals, for she would not have counted all such daisies there ever were or ever will be. It is still possible, even if not probable, that one of them will naturally have a different number of petals and thereby disprove her hypothesis. Nonetheless, having counted the petals on all the daisies of that species that currently exist on the planet, and finding all of them having twenty-four petals, her hypothesis that all such daisies have twenty-four petals would have attained a very high degree of probability. Therefore, botanists would generally accept it as true. Given this finding, she would then seek to formulate a theory explaining why this daisy species has precisely this number of petals, which would likely lead her to studying the specific genome (genetic makeup) of the species and looking for the specific gene or set of genes that control petal number.
This is a very simple hypothetical case regarding how science typically operates. It represents the scientific method in its idealized form. In actual practice, however, the process of doing science is almost always more complicated than this.
For one thing, progress in science does not generally take place smoothly, by the gradual accumulation of knowledge, as in our daisy example. That it does is another commonly held misconception about science. Rather, scientific advancement tends to proceed fitfully, as Thomas Kuhn (1922–1996) noted in his classic book, The Structure of Scientific Revolutions, with major scientific revolutions (or paradigm shifts
) occurring only occasionally. Within all scientific fields, particular theories reign at any given point in time. Sometimes facts begin to accumulate that do not fit well within the reigning model. Typically, that model is modified somewhat in an attempt to accommodate the new facts. However, sometimes scientists discover additional data that do not fit the modified theory, in which case that model might undergo additional modifications. The reigning theory typically continues to hold up in the face of the discovery of new data that do not conform to it until someone comes up with a new theory that offers a simpler explanation of the facts. Key here is the idea of incommensurability—that is, that the two paradigms have neither common interpretations of many key notions nor common standards by which the two theories could be evaluated. Scientists generally subscribe to the principle of Ockham’s (or Occam’s) razor, which states that, among competing explanations for something, the simpler explanation is usually true. If continued testing—ideally, of predictions made by the new model—supports the new theory, more scientists will gradually find it superior to the old one until, at some point, this theory becomes the new reigning model, and the paradigm shift is complete.
For a comparison of Ptolemy’s Geocentric model of our universe and Copernicus’s Heliocentric model, see Niko Lang’s image at http://en.wikipedia.org/wiki/File:Geoz_wb_en.svg.
This pattern has been witnessed historically in a number of cases. One example was the shift from the Ptolemaic (geocentric, or Earth-centered) cosmology to the Copernican (heliocentric, or Sun-centered) cosmology in the early Modern Era, about 1600–present (see the QR code above).⁸ That the Sun, Moon, and stars moved around the Earth had seemed obvious to people from the time they first looked up into the sky. Ptolemy (90–168) had already noted in the second century CE (or AD),⁹ however, that the planets did not move in a consistent, regular path around the Earth but occasionally engaged in "retrograde motion," in which they suddenly began moving backwards across the sky relative to their typical clockwise motion, only to stop at some point and begin moving forward again. In response to this, Ptolemy affirmed the theory that the planets did move in circular orbits around the Earth—the circle being, in his view, the most perfect geometrical form—but that they were tied to smaller orbital circles residing on the larger circles (see the QR code above). Thus, when the planets were moving backward, they were really only doing so as part of their movement on the smaller circles, not on the large orbital paths that went around the Earth.
When further, more precise observations in the late medieval period indicated that even this theory did not adequately account for the observed planetary motions, scientists sought to modify the Ptolemaic model further to accommodate the new facts. However, the problems and increasing complexity of the Ptolemaic theory caused some scientists to accept, under the guidance of Ockham’s razor, Nicolaus Copernicus’s (1473–1543) simpler theory:¹⁰ that the Earth and other planets moved around the Sun in simple, circular orbits. When the observations of other astronomers, such as Galileo Galilei (1564–1642), provided additional support for the Copernican theory, it soon became the new reigning theory. Thus a paradigm shift had occurred in cosmology.
The heliocentric model itself continued to evolve with the appearance of new data—for example, elliptical orbits replaced circular ones—but the model remains the paradigm today and will almost certainly continue to do so. The move from the catastrophic
to the evolutionary understanding of geological change on Earth¹¹—the change from a static to an evolutionary understanding of life on Earth—in the nineteenth century, and, in the twentieth, the move from Isaac Newton’s (1642–1726) to Albert Einstein’s (1879–1955) understanding of space, time, and gravity are further examples of such paradigm shifts in science.
All of this underscores that scientific theories are inherently historical, that what is believed to be the truth about nature has been at times, and in most fields, later shown to be inaccurate, at least to some degree, and that therefore at least some of the scientific theories we accept today may be shown to be false to a greater or lesser extent in the future. This means that those who proclaim that science presents us with the truth about physical reality are quite simply wrong. Rather, science provides us with the best current thinking about the way physical reality is, not a certainly true account of it. This also pertains to all religious theories (i.e., doctrines). Thus, any description of the nature of reality
is always tentative, historical, and susceptible to later correction.
The language of science is mathematics. In this language, science is most accurately stated.¹² Scientists usually translate that mathematical language into conceptual language in an attempt to understand what the math is telling them, and in order to communicate their findings to nonspecialists. Such translation, however, is not always possible, especially in the more esoteric forms of theoretical physics, such as with certain aspects of quantum mechanics or superstring theory. For a fully developed and accurate understanding of the natural sciences, one must learn this mathematical language. To do so, however, requires an intelligence and mathematical training that most of us simply do not have. Therefore, most of us are unable to understand this language and the science it describes in some significant ways. There is an analogy here with music, in that to be able to read a musical score, one must also learn a new symbol system and its rules of syntax (i.e., a new language).¹³ The point is that most of us will never fully understand science in its true, mathematical form, and so our understanding can only be conceptual, with all the translation problems entailed in conveying meaning from one language into another.
In addition, mathematical descriptions of nature will sometimes lead scientists to new discoveries about nature—rather than the more typical other way around—as it did for one of the early quantum physicists, Paul Dirac (1902–1984). Dirac was trying to describe the electron mathematically in light of Einstein’s relativity theory and quantum mechanics. What he ended up with were two mathematical equations that could be used to describe the electron, one for which the electron had the expected negative charge, but the other for which the electron had a positive charge. Everyone knew electrons had negative charges, and no one had ever encountered one with a positive charge, yet the equations were saying that it should exist. In addition, the equations indicated that, if a positively charged and a negatively charged electron collided, they would annihilate—literally destroy each other, so that nothing would remain of them except the amount of energy produced by their destruction.¹⁴ Therefore, Dirac, based on mathematics alone, had discovered the anti-electron, or positron, and, thus, the existence of antimatter, as well as the fact that, when matter and antimatter collide, they annihilate, resulting in the production of energy. The existence of antimatter was confirmed experimentally shortly thereafter, as was Dirac’s prediction of the energy produced when matter and antimatter annihilate. In this way, mathematics led scientists to new discoveries about physical reality.
Even more surprising than this is that the elegance or beauty of the mathematical equations is typically, if not always, an indicator of which equations accurately describe the nature of reality. Dirac reportedly altered his focus as a theoretical physicist from doing physics to searching for beautiful mathematical equations, and when he found them, he looked at nature to see what they described.
Mathematical beauty is something the mathematician and physicist recognize, but it is harder for the layperson to grasp. That equations can be mathematically beautiful involves their having certain qualities, such as simplicity, symmetry,¹⁵ depth of meaning, and perhaps unexpectedness. One example of such a mathematically beautiful equation is Einstein’s E=mc². It is simple, in that it employs only several terms—energy (E), mass (m), and the speed of light (c)—and it is an incredibly concise equation. It is profound and unexpected, in that it says that energy and mass are essentially the same thing in different forms, such that a little bit of mass is equivalent to a lot of energy and vice versa. It is also symmetrical, in that it indicates the conversion can go in both directions, mass to energy or energy to mass. The number of examples of this relationship between beauty and truth in the equations that describe the nature of the universe is significant.
Many physicists today continue to be driven by their belief that mathematically beautiful equations are the ones that describe nature, as we will see (in chapter 5) regarding scientists researching superstring theory. As string theorist Brian Greene has noted, [I]t is certainly the case that some decisions made by theoretical physicists are founded upon an aesthetic sense—a sense of which theories have an elegance and beauty of structure on par with the world we experience . . . So far, this approach has provided a powerful and insightful guide.
¹⁶ That mathematical beauty should be tied to scientific truth is even stranger than the fact that nature is inherently mathematical.
Another complexity in the actual practice of science is that the correct interpretation of relevant scientific data is not always clear-cut. Different scientists may interpret the same facts in quite different ways, and at times they do, which produces two or more competing theories. One example of this is the ongoing analysis of a roughly four-billion-year-old Martian meteorite found in 1984 in the Allan Hills region of Antarctica. The team that first analyzed the rock interpreted certain features they found, especially the presence of unusual organic molecules and mineral deposits, as indicators that Martian microbes once lived in that rock. Were this true—that there had once been life on Mars—it would be perhaps the greatest discovery in the history of science, and one that would significantly alter our understanding of the universe and our place in it, as well as the possibility of finding life elsewhere in the cosmos.
Subsequent analyses by other researchers, however, have resulted in interpretations of those mineral and organic deposits as products of certain chemical processes, not of living entities. Today the issue is still not settled, though it seems that more scientists are skeptical of the claim that the meteorite indicates the former presence of life than those who accept it. The point is that even well attested facts—in this case, mineral and organic compounds found in the rock, whose presence no one questions—can result in two quite different interpretations of what these facts mean. Similar disagreement can also be found in how the mathematics of a theory should be translated into conceptual form, as we will see in our discussion of quantum mechanics (in chapter 5).
Another complexity of science as actually practiced is that scientists cannot always directly observe the entities or processes they investigate. For one thing, some objects may be too small to observe and their movement so rapid that their existence and behavior can only be inferred from other evidence. For example, subatomic particles are impossible to see, even with our most sophisticated microscopic instruments. Therefore, the existence of such particles can only be inferred, such as by the bubble tracks they make in the cloud chambers of particle accelerators. This difficulty of interpretation in determining the existence and nature of things not directly observed is fundamental, not only to physics, but also to a number of other scientific fields.
Another, related complexity is known as the background problem.
This is the problem that the presence of certain data in an experiment that are irrelevant to the thing being studied complicate the interpretation of the experiment. The presence of tracks in cloud chambers left by stray particles (such as cosmic rays) that are not a result of the particle collision is one such example. The judgment of the experimenter determines what constitutes data relevant to the experiment and what is irrelevant background data. Not all experimenters’ judgments might agree. Even if they do agree, their judgments might not be correct. Thus, the background problem
is yet another complexity in the practice of science.
The idealized scientific method also fails to account for the fact that a fundamental distinction must be made between scientific theories that are directly testable and repeatable in the present and those that deal with historical events and processes, which are neither directly testable nor repeatable. For example, if a scientist wants to test some aspect of the standard theory of particle physics, she can do so in the present by undertaking experiments in a particle accelerator, which will tend to support, modify, or refute the reigning theory. Other scientists can replicate such experiments in different places, both now and in the future.
However, when studying features of the geological or evolutionary past, such as when and how layers of material were deposited in some ancient rock formation, or which ancient primate fossils might have been directly ancestral to human beings, the scientist obviously cannot observe or replicate in the present the laying down of those layers of material or the evolution of one species into another that occurred millions of years ago. Thus, in the evolutionary example, while fossil evidence can determine the degree of morphological similarity (similarity of form) between two ancient primates—assuming that scientists possess sufficiently complete skeletons of both—and perhaps that one came before the other, it cannot tell us if the one in fact evolved into the other. They might well have been similar but unrelated species. This does not mean that evolution (or geology) is in some way a deficient form of science, but rather that different sciences must be studied in ways appropriate to their nature, and that in some cases, as when dealing with unique historical events, different means of inquiry must be used, and these may not always yield definitive results.
Another deviation from the simple, idealized conception of the scientific method is the fact that theory sometimes precedes observation when scientists seek to understand certain phenomena, as is the case with contemporary superstring theory. Here, theoretical solutions to several problems within Big Bang cosmology and the Standard Model of particle physics have been offered based solely upon formulations that solve the problems in mathematically elegant ways. Yet, owing largely to the unimaginably small size of the strings postulated as the most fundamental constituents of the universe, there is to date neither experimental evidence nor even any conceivable experiments proffered by string theorists that might provide direct evidence for the truth or falsity of this theory.¹⁷ Here, hopefully, indirect experimental evidence will someday help determine whether the theory is probably true or not.
Related to this is an even more fundamental issue for science, which is that scientists necessarily rely on certain foundational assumptions about nature, which they cannot demonstrate to be true, yet upon which many of their fundamental theories are based. One example is the belief that the same natural laws have operated from the beginning of—and everywhere in—the universe in the same way as they do today in our solar neighborhood. While such assumptions are accepted because they seem to be reasonable, and some astronomical evidence suggests they are true, it remains the case that these assumptions still cannot, and perhaps never can, be validated. That such assumptions cannot be validated means that there is no way of knowing that they are true; they can only be believed to be true.
Relying on indemonstrable foundational assumptions about nature might not seem to be much of a problem, but an examination of the history of both mathematics and science shows that some assumptions believed true at one time have later been shown to be false. For example, before the invention of non-Euclidean geometry it was assumed that the shortest distance between two points is a straight line, and that the sum of the angles in a triangle always equals 180°. These definitions are true in Euclidean geometry, because that geometry deals with flat surfaces, such as a sheet of paper on a flat tabletop.
However, when scientists began to consider curved surfaces, such as the surface of the Earth, and what geometry would look like on large scales there, they quickly learned that the shortest distance between two points is a curved line, and that the sum of the angles of a triangle will always be greater than 180°. In fact, in the case of a right triangle, whose base stretches along Earth’s equator and its top is at one of the poles, the sum of its angles is 270° (three 90° angles). An example from science of an assumption later shown to be wrong was Isaac Newton’s assumptions that space was unchanging and time was unrelated to space, both of which Einstein later showed were false. Thus we cannot claim certainty regarding the truth of the assumptions scientists hold at any given time. The truth of foundational assumptions remains a matter of belief.
Perhaps the most fundamental assumption of all science is methodological naturalism or methodological materialism: namely, the assumption that nature is a closed system, such that things in nature and their behavior can be explained fully and only by other things in nature. Many scientists think that this assumption is necessary to the conduct of science, in that, if natural things were to be explained by things outside nature, such as God (as traditionally conceived), then that might well put an end to science. Scientists might not investigate anything very deeply, since God would be the easy answer to every question about the nature and behavior of physical things.
What is essential to understand here is that this assumption of methodological materialism does not assert anything whatsoever about whether something beyond
or in addition to the physical universe, such as a spiritual dimension of reality, exists or does not exist. To assert that nothing exists but the physical universe is to hold the belief called philosophical materialism. Although certain atheistic scientists sometimes state or imply otherwise, science itself does not assert anything one way or the other about the existence of spiritual reality, let alone prove or disprove its existence. Science, by virtue of its method, can only study the physical universe and the physical things in it and, therefore, has nothing to say about spiritual realities, such as God.
Thus, methodological materialism seems in the eyes of many scientists and philosophers of science to be a necessary assumption of science, but holding the view of philosophical materialism/atheism is not. The latter is a metaphysical preconception some scientists bring to the interpretation of science. It is not a consequence of science itself. The existence of a large percentage of scientists who are religious, shown consistently in objective surveys of scientists for at least a century,¹⁸ bears witness to this fact—as well as that religion is not in the process of dying out among scientists, as some inimical to it have suggested.
Perhaps the aspect of science as actually practiced that would be most surprising to the nonscientist is that science is not always a wholly objective or rational enterprise. This really should not come as a surprise, given that science, like every other human enterprise, is done by human beings, and we cannot simply put aside all of our personal foibles, our wants and needs, and other personal characteristics, when we engage in scientific research.
On the positive side, imagination and intuition often supplement conscious, rational thought. These have been so important in the history of science that Einstein famously said that imagination was more important for a scientist than knowledge. An example of this is the way Stephen Hawking (1942–) intuited how radiation might escape from a black hole via quantum tunneling—an idea that most, if not all, astrophysicists now accept as true.
On the other hand, the objectivity that the scientist would employ in her work is at times negatively affected by factors individual and social, including psychological, political, and economic concerns, as well as the metaphysical commitments already noted. For example, scientists tend to be skeptical of new theories, preferring rather to accept current, seemingly well-established ones. There is good reason for this, since most novel ideas in science prove to be wrong and, in some cases, spectacularly so, as with the claims for cold fusion some years ago.¹⁹ Although such conservatism is often a sound scientific practice, it can also retard scientific progress by preventing some novel ideas from receiving the attention they deserve—at least for a time. Murray Gell-Mann (1929–) recently made this point with regard to some scientists’ skeptical reception of his radical new quark theory in the early 1960s.²⁰ Standing on the wrong side of the theoretical divide in science can result in the reduction of one’s stature in the field and thus a limitation of future prospects for professional advancement and research funding. Given these realities, it seems prudent for the scientist to go along with the predominant view of the scientific community, even if it is not necessarily the best for scientific progress.
Interestingly, though, there is also a certain countervailing tendency to this theoretical conservatism among scientists, because one is most likely to gain recognition from one’s peers—and all that goes with it psychologically, professionally, and economically—when one disproves a currently held theory. This is why scientists like Galileo, Darwin, and Einstein are famous both within and without the scientific community. They risked going against the standard scientific thought of their time to propose new theoretical models neither obvious nor immediately accepted at the time by other scientists in their fields, yet their theories subsequently came to be accepted as fundamental truths about nature. Thus, there is a significant incentive to be a maverick in science, despite the personal and professional risk. Nevertheless, the fact that going against prevailing theories more often than not turns out badly for the scientist helps explain why the majority tendency is to side with current theories.
In addition, philosophical and/or religious views can influence what theories a scientist chooses to believe and/or how he interprets their meaning. For example, it is widely known that cosmologist Fred Hoyle (1915–2001) preferred his steady-state theory of cosmic origins to the Big Bang theory partly because he was an atheist who believed Christians could use the Big Bang theory in support of their doctrine of God’s creation of the universe out of nothing.
²¹ Indeed, despite the accumulation of ever more evidence supporting the Big Bang model and the absence of evidence in support of his steady-state theory, Hoyle evidently continued to subscribe to his theory to the end of his life.
On the other side of the religious divide, Michael Behe (1952–), a conservative Christian biochemist and Intelligent Design²² spokesperson, has interpreted certain chemical processes in our bodies to be "irreducibly complex"—so complex as to be beyond any reasonable possibility of having evolved naturally. This, he claims, is proof that God must have established them—meaning, of course, that God must exist (though, like other Intelligent Design proponents, he prefers not to speak of God as the one responsible, only the Designer, in the hope that Intelligent Design might be taught in public schools as science). While scientists have shown how such biochemical processes have evolved, Behe continues to believe in Intelligent Design. Every scientist and theologian, like every other person, has certain core beliefs about the nature