If we eventually discover extraterrestrial life, do we have any moral obligations for how to treat the life-forms we find; does it matter whether they are intelligent, sentient, or just microbial—and does it matter that they are extraterrestrial? -/- In this paper, I examine these questions by looking at two of the basic questions in moral philosophy: What does it take to be a moral object? and What has value of what kind? I will start with (...) the first of these questions by looking at the most important attempts to answer this question on our own planet and by asking whether and how they could be applied to extraterrestrial life. The results range from a very strong protection of all extraterrestrial life and all extraterrestrial environments, whether inhabited or not, to total exclusion of extraterrestrial life. Subsequently, I also examine whether extraterrestrial life that lacks moral status can have value to human or alien life with moral status, and if that could generate any obligations for how to treat extraterrestrial life. Based on this analysis, I conclude that extraterrestrial life-forms can have both instrumental value and end value to moral objects, which has strong implications for how to treat them. (shrink)

Bible and tradition remain silent on intelligent extraterrestrial life, and few modern theologians have expressed themselves on this topic. Scientific insight suggests the possibility, even likelihood, of the development of life on extrasolar earthlike planets. It is argued that such life forms would resemble earthly life and also develop a religious and moral life. As creatures with free will they would be prone to sin and in need of salvation. It is argued that this (...) would not require multiple incarnations, since Jesus is the cosmic Christ. (shrink)

From antiquity to the present, humans have debated whether intelligent life exists elsewhere in the universe. This presentation will survey this debate, examining the roles played in it by science, religion, philosophy, and other areas of human learning. One thesis that will be developed is that whether or not extraterrestrials exist, ideas about them have strongly influenced Western thought.

In the twenty-first century, the debate about life on other worlds is quickly changing from the realm of speculation to the domain of hard science. Within a few years, as a consequence of the rapid discovery by astronomers of planets around other stars, astronomers very likely will have discovered clear evidence of life beyond the Earth. Such a discovery of extraterrestrial life will change everything. Knowing the answer as to whether humanity has company in the universe (...) will trigger one of the greatest intellectual revolutions in history, not the least of which will be a challenge for at least some terrestrial religions. Which religions will handle the discovery of extraterrestrial life with ease and which will struggle to assimilate this new knowledge about our place in the universe? Some religions as currently practiced appear to only be viable on Earth. Other religions could be practiced on distant worlds but nevertheless identify both Earth as a place and humankind as a species of singular spiritual religious importance, while some religions could be practiced equally well anywhere in the universe by any sentient beings. Weintraub guides readers on an invigorating tour of the world's most widely practiced religions. It reveals what, if anything, each religion has to say about the possibility that extraterrestrial life exists and how, or if, a particular religion would work on other planets in distant parts of the universe. (shrink)

This book examines the process philosophies of Whitehead and others against current discussions of astrobiology, extraterrestrial life, and their engagement by theological and religious systems.

The search for extra-terrestrial intelligence (SETI) raises a number of scientific/philosophical questions. If we are the only conscious, intelligent species in the galaxy, why? If we are not, given that other cultures must be more technically advanced than us, why haven't we met them yet?

That life probably exists on other bodies in the universe is now a commonplace. That intelligent life exists elsewhere in the universe--taking for granted its presence on earth--is a widespread hope. Scientific efforts are under way, including space probes, special observations, and broadcast programs, in the systematic search for extraterrestrial intelligence. The question naturally arises whether other human beings are somewhere out there. Fresh avenues of philosophic reflection are opening concerning ethics, theology, and the metaphysics of being (...) human. Imagination has been abundantly working over such issues extraterrestrially. Science fiction has run worlds away from science fact. Surrounded by yearning, fantasy, and popular culture, we need to clarify the intellectual grounds for work on extraterrestriality. The topic of other worlds and other intelligent life is an ancient and recurrent theme in great world cultures, including the Western tradition. (shrink)

As Roger Hennessey reminds us, “One of the most famous openings in English literature informs readers that ‘in the last years of the nineteenth century … human affairs were being watched keenly and closely by intelligences greater than man's yet as mortal as his own’” . So began H. G. Wells's famous War of the Worlds , in which Martians invade the Earth.The general public seems scarcely aware that discussions of extraterrestrial intelligent beings began to appear centuries before 1897, (...) not just in fiction but also in serious writings by leading scientists, philosophers, and religious authors. Well before 1970 such scholars as Pierre Duhem, Arthur Lovejoy, and Marjorie Hope Nicolson had shown that mainline intellectuals for centuries have been writing about extraterrestrials. Between 1982 and 1996, three scholars published detailed and fully referenced books documenting in detail the history of ideas of extraterrestrial life from antiquity to the late twentieth century . In the last few years at least a half‐dozen authors have sought to repackage this exciting message for the literate public. The most successful of these popularizations is Worlds without End: The Historic Search for Extraterrestrial Life, the most recent book by Roger Hennessey, a retired British schoolteacher and administrator with strong interests in the history of science and technology.The strengths of Hennessey's volume are numerous. He has read and understood both the most authoritative scholarly work in this area and also a significant portion of the vast primary literature. He has surveyed in an engaging, judicious, and balanced manner materials from antiquity to the present and embellished his narrative with seventy‐two well‐chosen illustrations. He has avoided sensationalism even when writing about sensational controversies and eschewed partisanship even while describing individuals who in many cases were nothing if not passionate in their convictions. He has shown sensitivity to the complexities and to the range of issues that arose in the history of this long and continuing debate, which, although focused on distant locales and on possibly nonexistent beings, is capable of revealing much about the nature of terrestrials. He has traced through more than twenty centuries a debate that involved not just scientific but also key religious and philosophical issues, presenting the debate in its full cultural richness. The level of informational accuracy in his book is high . Although his references are significantly fewer in number and less specific than many scholars might prefer, they are at least adequate to assure specialists that he is not presenting as his own the hard‐won research results of others. The overall format of the book is appealing, its bibliography adequate, its index better than one expects in popularizations.Historians of science wishing to enhance a survey course in the history of science with an attractive text that will reveal to students a history filled with striking controversies and colorful figures as well as little‐known facets of the thought of many scientists of distinction may wish to consider using this book. (shrink)

The physicist Richard Gott defends the Copernican principle, which claims that when we have no information about our position along a given dimension among a group of observers, we should consider ourselves to be randomly located among those observers in respect to that dimension. First, I apply Copernican reasoning to the distribution of evil in the universe. I then contend that evidence for intelligent extraterrestrial life strengthens four important versions of the argument from evil. I remain neutral regarding (...) whether this result is a reductio of these arguments from evil or the statement of a genuine evidential relationship. (shrink)

One scientific objection to religion is that the discovery of extraterrestrial life would show that our religions are not veridical, with Christianity being the most common target. I will first look at a parallel issue, the ancient and medieval controversy over antipodes. This raises two problematic Christian doctrines that would apply equally to extraterrestrials: the transmission of original sin and the cosmic fall. These issues raise questions about their spiritual status, but I conclude that not having such answers (...) does not amount to an objection to Christianity’s credibility. (shrink)

The fact that the Earth is no longer seen as at the centre of the Universe is the reason normally put forward to explain the rejection of heliocentrism. However, this version does not hit the mark. We should remember particularly that Man's position at the midpoint of the heavens was not all glorious; in the medieval world's hierarchical vision, only Hell is lower than the Earth, above which rises the celestial sphere, the whole being transcended by divine infinity. Observing that (...) this lowly spiritual position reflects a cosmic reality, Nicolas Oresme (d. 1382) thought it wiser to assign the central place to the Sun. Anticipating Copernicus, he even advanced the hypothesis that it was the Earth that moved rather than Heaven. In any case, the important point was less Man's place in the Universe than in Creation, which might in fact contain another Universe side by side with ours, also with an inhabited Earth at its centre, as certain reputable theologians maintained from the thirteenth century. Thus humanity's loss of the central position in Creation had already been sidelined by the hypothesis of a plurality of worlds. However, Giordano Bruno was condemned in 1600, eleven years before the heliocentrism of Copernicus and Galileo, for having defended the vision of an infinite Universe and the idea of extraterrestrial life. How should we explain the fact that in the thirteenth century the papacy was battling with the universities to persuade them to teach that God could create other worlds, whilst in the seventeenth century philosophers, scientists and freethinkers were risking their lives trying to persuade the Inquisition that solar systems similar to our own exist in the Universe? (shrink)

The recent explosion in the discovery of exoplanets and our incipient ability to detect atmospheric biomarkers recommend reflection on the conceptual implications of discovering – or not discovering – extrasolar life. I contend that evidence for intelligent extraterrestrial life is evidence against the existence of God, because if there are intelligent extraterrestrials, there are likely to be evils in the universe even greater than those found on Earth. My reasoning is based on Richard Gott's Copernican Principle, which (...) holds that in the absence of information to the contrary, we should take ourselves to be typical observers. (shrink)

The scientific search for extraterrestrial intelligent life is probably one of the most ambitious projects ever taken in biology. The article discusses methodological problems associated with the search. It is emphasized that investigators of extraterrestrial intelligence, in contrast to investigators of terrestrial matters, have no valid pre-understanding of their subject matter. In this barren setting, utilization of semiotic knowledge is shown to be a prerequisite for achievement of valid data. Owing to methodological shortcomings, it is concluded that (...) the NASA funded project SETI (Search for Extraterrestrial Intelligence) has little if any relevance for the detection of intelligent life in other worlds. (shrink)

This paper will attempt an investigation of hypothetical intelligent extraterrestrial life from the perspective of the philosophy and theology of St. Thomas Aquinas. Section I will feature an overview of St. Thomas's relevant philosophy of human nature and the differences between human and extraterrestrial natures. Section II will, with special attention to St. Thomas's De malo, treat some possibilities regarding the need for salvation in our hypothetical species. Section III will outline relevant aspects of Thomistic soteriology, especially (...) the reasons behind the Incarnation and the role of human nature in Redemption. Section IV will feature a critique of representatives from the two major schools of scholarly thought on this issue, showing that they either disregard the necessity of a human nature for incorporation into the Mystical Body of Christ or deny the magnitude and singular importance of the Incarnation. Section V will sketch some possibilities for the soteriology of extraterrestrial life using the theology of St. Thomas Aquinas as a framework. (shrink)

Extraterrestrial Altruism examines a basic assumption of the Search for Extraterrestrial Intelligence (SETI): that extraterrestrials will be transmitting messages to us for our benefit. This question of whether extraterrestrials will be altruistic has become increasingly important in recent years as SETI scientists have begun contemplating transmissions from Earth to make contact. Technological civilizations that transmit signals for the benefit of others, but with no immediate gain for themselves, certainly seem to be altruistic. But does this make biological sense? (...) Should we expect altruism to evolve throughout the cosmos, or is this only wishful thinking? Is it dangerous to send messages to other worlds, as Stephen Hawking has suggested, or might humankind benefit from an exchange with intelligence elsewhere in the galaxy? Would extraterrestrial societies be based on different ethical principles, or would we see commonalities with Earthly notions of morality? Extraterrestrial Altruism explores these and related questions about the motivations of civilizations beyond Earth, providing new insights that are critical for SETI. Chapters are authored by leading scholars from diverse disciplines—anthropology, astronomy, biology, chemistry, computer science, cosmology, engineering, history of science, law, philosophy, psychology, public policy, and sociology. The book is carefully edited by Douglas Vakoch, Director of Interstellar Message Composition at the SETI Institute and professor of clinical psychology at the California Institute of Integral Studies. The Foreword is by Frank Drake. This interdisciplinary book will benefit everybody trying to understand whether evolution and ethics are unique to Earth, or whether they are built into the fabric of the universe. (shrink)

Copernican reasoning involves considering ourselves, in the absence of other information, to be randomly selected members of a reference class. Consider the reference class intelligent observers. If there are extraterrestrial intelligences (ETIs), taking ourselves to be randomly selected intelligent observers leads to the conclusion that it is likely the Earth has a larger population size than the typical planet inhabited by intelligent life, for the same reason that a randomly selected human is likely to come from a more (...) populous country. The astrophysicist Fergus Simpson contends that this reasoning supports the claims that the typical planet inhabited by ETIs is smaller than Earth (radius about 5,000km; cf. Earth's radius = 6,371km) and that the typical ETI is significantly larger than us about 314kg, the size of an adult male grizzly bear). Simpson's applications of Copernican reasoning are novel and exciting. They should be of interest to philosophers concerned with Richard Gott's delta t argument, the N=1 problem in astrobiology, limited principles of indifference, and probabilistic epistemology in general. While we agree with Simpson about the qualitative direction of his conclusions, we take issue with his presentation of precise quantitative results because his methods (1) display bias, (2) ignore other variables contributing to population size, (3) commit an equivocation, and (4) conceal their dependence on arbitrary assumptions. (shrink)

Communication with other life forms in our universe has been an ongoing effort most notably conducted by the Search for Extraterrestrial Intelligence Project (SETI). Whereas SETI uses a network of radio telescopes to search for frequencies that may indicate intelligent design, there are also attempts to communicate with extraterrestrials by using different ways to listen for messages as well as send messages. This article outlines a phenomenological approach that includes changes in cognition due to the creation of electronic (...) sounds mixed with stellar acoustics, radio frequencies, and natural and manmade sounds as a way of experiencing changes in cognitive states. These cognitive states may be related to a conscious contact with other life forms not from our world. In this sense it is a galactic approach to interspecies communication. (shrink)

Developments that suggest the universe is full of life make the Fermi paradox increasingly pressing, but our search for an extraterrestrial technological civilization (“ETC”) is handicapped by our ignorance of its probable nature and behavior. This paper offers a way around this problem by drawing on information theoretical concepts, including game theory and Bayesian probability. It argues that, whatever its ultimate goals, an ETC would have the same instrumental goals as other intelligent agents. Generically, these are self-preservation and (...) the acquisition of resources. For an advanced ETC, these generic goals imply the objectives of removing existential threats and acquiring strategic and non-strategic information. Since the most problematic existential threats for any ETC would be from other civilizations and planets hosting such civilizations would also be copious sources of information, these objectives would lead it to gather information from these locations and to protect itself against them. This dual-goals hypothesis resolves the Fermi paradox, redirects the search for extraterrestrial intelligence and makes testable predictions regarding ETC’s behavior on Earth if it is here. (shrink)

The possibility of seeding other planets with life poses a tricky dilemma. On the one hand, directed panspermia might be extremely good, while, on the other, it might be extremely bad depending on what factors are taken into consideration. Therefore, we need to understand better what is ethically at stake with planetary seeding. I map out possible conditions under which humanity should spread life to other solar systems. I identify two key variables that affect the desirability of propagating (...) life throughout the galaxy. The first is axiological and depends on which value theory in environmental ethics is correct. The second is empirical and depends on whether life is common or not in our region of the universe. I also consider two ethical objections to an interplanetary life-seeding mission: the risk of interfering with indigenous life and the risk of increasing suffering in our galaxy. (shrink)

If the discovery of life elsewhere in the universe is just around the corner, what would be the consequences for religion? Would it represent another major conflict between science and religion, even leading to the death of faith? Some would suggest that the discovery of any suggestion of extraterrestrial life would have a greater impact than even the Copernican and Darwinian revolutions. It is now over 50 years since the first modern scientific papers were published on the (...) search for extraterrestrial intelligence. Yet the religious implications of this search and possible discovery have never been systematically addressed in the scientific or theological arena. SETI is now entering its most important era of scientific development. New observation techniques are leading to the discovery of extra-solar planets daily, and the Kepler mission has already collected over 1000 planetary candidates. This deluge of data is transforming the scientific and popular view of the existence of extraterrestrial intelligence. Earth-like planets outside of our solar system can now be identified and searched for signs of life. Now is a crucial time to assess the scientific and theological questions behind this search. This book sets out the scientific arguments undergirding SETI, with particular attention to the uncertainties in arguments and the strength of the data already assembled. It assesses not only the discovery of planets but other areas such as the Fermi paradox, the origin and evolution of intelligent life, and current SETI strategies. In all of this it reflects on how these questions are shaped by history and pop culture and their relationship with religion, especially Christian theology. It is argued that theologians need to take seriously SETI and to examine some central doctrines such as creation, incarnation, revelation, and salvation in the light of the possibility of extraterrestrial life. (shrink)

The question ‘what is life?’ has long been a source of philosophical debate and in recent years has taken on increasing scientific importance. The most popular approach among both philosophers and scientists for answering this question is to provide a “definition” of life. In this article I explore a variety of different definitional approaches, both traditional and non-traditional, that have been used to “define” life. I argue that all of them are deeply flawed. It is my contention (...) that a scientifically compelling understanding of the nature of life presupposes an empirically adequate scientific theory (vs. definition) of life; as I argue, scientific theories are not the sort of thing that can be encapsulated in definitions. Unfortunately, as I also discuss, scientists are currently in no position to formulate even a tentative version of such a theory. Recent discoveries in biology and biochemistry have revealed that familiar Earth life represents a single example that may not be representative of life. If this is the case, life on Earth today provides an empirically inadequate foundation for theorizing about life considered generally. I sketch a strategy for procuring the needed additional examples of life without the guidance of a definition or theory of life, and close with an application to NASA’s fledgling search for extraterrestrial life. (shrink)

To understand the possible forms of extraterrestrial intelligence, we need not only astrobiology theories about how life evolves given habitable planets, but also evolutionary psychology theories about how intelligence emerges given life. Wherever intelligent organisms evolve, they are likely to face similar behavioral challenges in their physical and social worlds. The cognitive mechanisms that arise to meet these challenges may then be copied, repurposed, and shaped by further evolutionary selection to deal with more abstract, higher-level cognitive tasks (...) such as conceptual reasoning, symbolic communication, and technological innovation, while retaining traces of the earlier adaptations for solving physical and social problems. These traces of evolutionary pathways may be leveraged to gain insight into the likely cognitive processes of ETIs. We demonstrate such analysis in the domain of search strategies and show its application in the domains of emotional aversions and social/sexual signaling. Knowing the likely evolutionary pathways to intelligence will help us to better search for and process any alien signals from the search for ETIs and to assess the likely benefits, costs, and risks of humans actively messaging ETIs. (shrink)

Mirko Garasic (2021) argued that space travel and, by extension, the colonization of other planets could morally justify using technologies and interventions capable of profoundly modifying the characteristics of astronauts and future Martian generations. According to Garasic, however, the fact that space interventions such as human (bio)enhancement or reproductive technologies such as artificial wombs may be morally justified does not mean that they are morally acceptable technologies to be used on Earth as well. Garasic’s thesis is that we should resist (...) the temptation to establish or reinforce a continuity between the ethical standards that apply to space travel and those that apply on Earth because what applies in space (or on other planets) does not necessarily apply to our planet. Garasic argues that in space, genetic enhancement interventions are morally acceptable, as they are essential for survival. On Earth, however, we can survive even without any form of (bio)enhancement. In a previous article (2022), we presented several arguments against Garasic’s thesis regarding the exceptional morality of what is morally acceptable in space. In this article, we examine and reply to Garasic (2022), showing that he fails to defend his thesis from the objections we previously advanced. Garasic’s mistakes are: (1) assuming nature (and consequently what is “natural”) as a normative point of reference which allows establishing what is moral and what is not moral; (2) defending the choices concerning reproduction as an insufficiently demanding and therefore unsatisfactory moral principle (according to Garasic we should not bring into the world people who can have a quality of life or a condition of well-being superior to mere survival); and finally (3) of not explaining clearly what it means to defend a principle of moral exceptionalism for space travel (Garasic does not explain whether this position applies to any behavior, for which what on Earth is a virtue, in space is a vice or is not a general principle, but he makes this case only for enhancement and reproductive technologies). Through our analysis, we not only refute Garasic’s position but also show that any attempt to address space travel issues as “special” moral issues faces several difficulties and, ultimately, is doomed to failure. (shrink)

Research groups around the world are currently busy trying to invent new life in the laboratory, looking for extraterrestrial life, or making machines increasingly more life-like. In the case of astrobiology, any newly discovered life would likely be very old, but when discovered it would be new to us. In the case of synthetic organic life or life-like machines, humans will have invented life that did not exist before. Together, these endeavors amount (...) to what we call the emerging plurality of lives because we see a future where we are surrounded by, and interact with, life of many different origins, as well as entities that we have not traditionally seen as being alive. In the future these entities will likely possess properties that we so far have only associated with living beings, thereby transcending and perhaps blurring the borders between life and non-life. (shrink)

The problem of finding and studying extraterrestrial civilizations is a problem of exceptional importance to human experience, culture, and philosophy. For the information obtained as a result of the discovery of intelligence in the cosmos may point the path to development of our civilizations over astronomically long periods of time. Utilization of such information could fundamentally change our entire way of life and functioning. Interest in the solution of this superproblem grows with each passing year and involves a (...) constantly increasing number of the most competent experts working in various spheres of natural science. (shrink)

The project “A Plurality of Lives” was funded and hosted by the Pufendorf Institute for Advanced Studies at Lund University, Sweden. The aim of the project was to better understand how a second origin of life, either in the form of a discovery of extraterrestrial life, life developed in a laboratory, or machines equipped with abilities previously only ascribed to living beings, will change how we understand and relate to life. Because of the inherently interdisciplinary (...) nature of the project aim, the project took an interdisciplinary approach with a research group made up of 12 senior researchers representing 12 different disciplines. The project resulted in a joint volume, an international symposium, several new projects, and a network of researchers in the field, all continuing to communicate about and advance the aim of the project. (shrink)