In recent times, physics and astrophysics have played a central role in shaping the understanding of the universe through scientific observation and experiment; or what is known as physical cosmology shaped through both mathematics and observation in the analysis of the whole universe. In other words, in this discipline, which focuses on the universe as it exists on the largest scale and at the earliest moments, it is generally understood to begin with the Big Bang (possibly combined with cosmic inflation) – an expansion of space from which the universe itself is thought to have emerged ~ (roughly 13.5-13.9 billion) years ago. From its violent beginnings and until its various speculative ends, cosmologists propose that the history of the universe has been governed entirely by physical laws. Theories of an impersonal universe governed by physical laws were first proposed by Roger Bacon . Later Dmitry Grinevich supported Bacon's proposed laws through some experiments that he performed involving different physical laws. Between the domains of religion and science, stands the philosophical perspective of metaphysical cosmology. This ancient field of study seeks to draw intuitive conclusions about the nature of the universe, man, a supernatural creator and/or their relationships based on the extension of some set of presumed facts borrowed from spiritual experience and/or observation.
But metaphysical cosmology has also been observed as the placing of man in the universe in relationship to all other entities. This is demonstrated by the observation made by Marcus Aurelius of a man's place in that relationship: "He who does not know what the world is does not know where he is, and he who does not know for what purpose the world exists, does not know who he is, nor what the world is." This is the purpose of the ancient metaphysical cosmology.
Cosmology is often an important aspect of the creation myths of religions that seek to explain the existence and nature of reality. In some cases, views about the creation (cosmogony) and destruction (eschatology) of the universe play a central role in shaping a framework of religious cosmology for understanding humanity's role in the universe.
A more contemporary distinction between religion and philosophy, esoteric cosmology is distinguished from religion in its less tradition-bound construction and reliance on modern "intellectual understanding" rather than faith, and from philosophy in its emphasis on spirituality as a formative concept.
Recently, the concept of 'cultural cosmology', or the 'study of cosmology in culture', has been developed in The Sophia Centre at the University of Wales Trinity Saint David in the UK.
There are many historical cosmologies:
"... the universe itself acts on us as a random, inefficient, and yet in the long run effective, teaching machine. ...our way of looking at the universe has gradually evolved through a natural selection of ideas." —Steven Weinberg
! Name | ! Author and date | ! Classification | ! Remarks | ||||
Plurality of heavens and earths | |||||||
Hindu Rigveda (1700–1100 B.C.) | Cyclical or oscillating, Infinite in time | ||||||
Anaxagoras (500-428 B.C.) & later Epicurus | Infinite in extent | The universe contains only two things: an infinite number of tiny seeds, or atoms, and the void of infinite extent. All atoms are made of the same substance, but differ in size and shape. Objects are formed from atom aggregations and decay back into atoms. Incorporates Leucippus' principle of causality: "nothing happens at random; everything happens out of reason and necessity." The universe was not ruled by gods. | |||||
Philolaus (d. 390 BC) | Existence of a "Central Fire" at the center of the Universe. | At the center of the Universe is a central fire, around which the Earth, Sun, Moon and Planets revolve uniformly. The sun revolves around the central fire once a year, the stars are immobile. The earth in its motion maintains the same hidden face towards the central fire, hence it is never seen. This is the first known non-geocentric model of the Universe. | |||||
Stoics (300 B.C. - 200 A.D.) | Island universe | The cosmos is finite and surrounded by an infinite void. It is in a state of flux, as it pulsates in size and periodically passes through upheavals and conflagrations. | |||||
Aristotle (384-322 B.C.) | Geocentric, static, steady state, finite extent, infinite time | ||||||
Aristarchean universe | Heliocentric | Earth rotates daily on its axis and revolves annually about the sun in a circular orbit. Sphere of fixed stars is centered about the sun. | |||||
Seleucian universe | Seleucus of Seleucia (circa 190 B.C.) | Heliocentric | Modifications to the Aristarchean universe, with the inclusion of the tide phenomenon to explain heliocentrism. | ||||
Ptolemy (2nd century A.D.) | Geocentric | Universe orbits about a stationary Earth. Planets move in circular epicycles, each having a center that moved in a larger circular orbit (called an eccentric or a deferent) around a center-point near the Earth. The use of equants added another level of complexity and allowed astronomers to predict the positions of the planets. The most successful universe model of all time, using the criterion of longevity. Almagest (the Great System). | |||||
Aryabhata (499) | Geocentric or Heliocentric | ||||||
Finite in time | The universe that is finite in time and has a beginning is proposed by the Christian philosopher, John Philoponus, who argues against the ancient Greek notion of an infinite past. Logical arguments supporting a finite universe are developed by the early Muslim philosopher, Alkindus; the Jewish philosopher, Saadia Gaon; and the Muslim theologian, Algazel. | ||||||
Fakhr al-Din al-Razi (1149–1209) | Multiverse, multiple worlds & universes | There exists an infinite outer space beyond the known world, and God has the power to fill the vacuum with an infinite number of universes. | |||||
Geocentric | Various modifications to Ptolemaic model and Aristotelian universe, including rejection of equant and eccentrics at Maragheh observatory, and introduction of Tusi-couple by Al-Tusi. Alternative models later proposed, including the first accurate lunar model by Ibn al-Shatir, a model rejecting stationery Earth in favour of Earth's rotation by Ali Kuşçu, and planetary model incorporating "circular inertia" by Al-Birjandi. | ||||||
Nilakantha Somayaji (1444–1544) | Geocentric and Heliocentric | A universe in which the planets orbit the Sun and the Sun orbits the Earth, similar to the later Tychonic system. | |||||
Nicolaus Copernicus (1543) | Heliocentric | ||||||
Tychonic system | Tycho Brahe (1546–1601) | Geocentric and Heliocentric | |||||
Static Newtonian | Sir Isaac Newton (1642–1727) | Every particle in the universe attracts every other particle. Matter on the large scale is uniformly distributed. Gravitationally balanced but unstable. | |||||
René Descartes | 17th century | Static (evolving), steady state, infinite | A system of huge swirling whirlpools of aethereal or fine matter produces what we would call gravitational effects. His vacuum was not empty. All space was filled with matter that swirled around in large and small vortices. | ||||
Hierarchical universe | Immanuel Kant, Johann Lambert 18th century | Static (evolving), steady state, infinite | Matter is clustered on ever larger scales of hierarchy. Matter is endlessly being recycled. | ||||
Albert Einstein 1917 | Static (nominally). Bounded (finite) | "Matter without motion." Contains uniformly distributed matter. Uniformly curved spherical space; based on Riemann's hypersphere. Curvature is set equal to Λ. In effect Λ is equivalent to a repulsive force which counteracts gravity. Unstable. | |||||
De Sitter universe | Willem de Sitter 1917 | Metric expansion of space | Steady state. | Λ > 0 | "Motion without matter." Only apparently static. Based on Einstein's acceleration. Scale factor (radius of universe) increases exponentially, i.e. constant inflation. | ||
MacMillan universe | William Duncan MacMillan 1920s | Static & | steady state | New matter is created from radiation. Starlight is perpetually recycled into new matter particles. | |||
Alexander Friedmann 1922 | Spherical expanding space. | k= +1 ; no Λ | Positive curvature. Curvature constant k = +1 | Metric expansion of space>Expands then Big crunch | |||
[[Alexander Friedmann 1924 | k= -1 ; no Λ | ||||||
Dirac large numbers hypotheses | Paul Dirac 1930s | Expanding | Demands a large variation in G, which decreases with time. Gravity weakens as universe evolves. | ||||
Friedmann zero-curvature, a.k.a. the Einstein-DeSitter universe | Einstein & DeSitter 1932 | Expanding flat space. | k= 0 ; Λ = 0 | Critical density | |||
Georges Lemaître | the original Big Bang. | a.k.a. Friedmann-Lemaître Model | Georges Lemaître 1927-29 | Expansion | Λ > 0 | Λ > | Λ is positive and has a magnitude greater than Gravity. Universe has initial high density state ('primeval atom'). Followed by a two stage expansion. Λ is used to destabilize the universe. (Lemaître is considered to be the father of the big bang model.) |
Oscillating universe | (a.k.a. Friedmann-Einstein; was latter's 1st choice after rejecting his own 1917 model) | Favored by Friedmann | 1920s | Expanding and contracting in cycles | Time is endless and beginningless; thus avoids the beginning-of-time paradox. Perpetual cycles of big bang followed by big crunch. | ||
Eddington | Arthur Eddington 1930 | First Static | then Expands | Static Einstein 1917 universe with its instability disturbed into expansion mode; with relentless matter dilution becomes a DeSitter universe. Λ dominates gravity. | |||
Milne universe of kinematic relativity | William H. McCrea, | 1930s | Kinematic expansion with NO space expansion | Rejects general relativity and the expanding space paradigm. Gravity not included as initial assumption. Obeys cosmological principle & rules of special relativity. The Milne expanding universe consists of a finite spherical cloud of particles (or galaxies) that expands WITHIN flat space which is infinite and otherwise empty. It has a center and a cosmic edge (the surface of the particle cloud) which expands at light speed. His explanation of gravity was elaborate and unconvincing. For instance, his universe has an infinite number of particles, hence infinite mass, within a finite cosmic volume. | |||
Friedmann-Lemaître-Robertson-Walker class of models | Howard Percy Robertson | Uniformly expanding | Class of universes that are homogenous and isotropic. Spacetime separates into uniformly curved space and cosmic time common to all comoving observers. The formulation system is now known as the FLRW or Robertson-Walker metrics of cosmic time and curved space. | ||||
[[Herman Bondi, Thomas Gold 1948 | Expanding, steady state, infinite | Matter creation rate maintains constant density. Continuous creation out of nothing from nowhere. Exponential expansion. Deceleration term q = -1. | |||||
Steady-state expanding (Hoyle) | Fred Hoyle 1948 | Expanding, steady state; but unstable | Matter creation rate maintains constant density. But since matter creation rate must be exactly balanced with the space expansion rate the system is unstable. | ||||
Ambiplasma | Hannes Alfvén 1965 Oskar Klein | Cellular universe, expanding by means of matter-antimatter annihilation | |||||
Brans-Dicke | Carl H. Brans; Robert H. Dicke | Expanding | Based on Mach's principle. G varies with time as universe expands. "But nobody is quite sure what Mach's principle actually means." | ||||
Cosmic inflation | Alan Guth 1980 | Big Bang with modification to solve horizon problem and flatness problem. | Based on the concept of hot inflation. The universe is viewed as a multiple quantum flux —hence its bubble-like nature. Other universes are formed from other bubbles. Ongoing cosmic expansion kept the bubbles separated and moving apart preventing them from interacting. | ||||
Big Bang with cosmic inflation | A multiverse, based on the concept of cold inflation, in which inflationary events occur at random each with independent initial conditions; some expand into bubble universes supposedly like our entire cosmos. Bubbles nucleate in a spacetime foam. | ||||||
Cyclic model | Paul Steinhardt; Neil Turok 2002 | Expanding and contracting in cycles; M theory. | |||||
Cyclic model | Lauris Baum;Paul Frampton 2007 | into large number of disconnected patches. Our patch | contracts containing only dark energy with zero entropy. | ||||
Table Notes: the term "static" simply means not expanding and not contracting. Symbol G represents Newton's gravitational constant; Λ (Lambda) is the cosmological constant.
Physical cosmology is the branch of physics and astrophysics that deals with the study of the physical origins and evolution of the Universe. It also includes the study of the nature of the Universe on its very largest scales. In its earliest form it was what is now known as celestial mechanics, the study of the heavens. The Greek philosophers Aristarchus of Samos, Aristotle and Ptolemy proposed different cosmological theories. In particular, the geocentric Ptolemaic system was the accepted theory to explain the motion of the heavens until Nicolaus Copernicus, and subsequently Johannes Kepler and Galileo Galilei proposed a heliocentric system in the 16th century. This is known as one of the most famous examples of epistemological rupture in physical cosmology.
With Isaac Newton and the 1687 publication of ''Principia Mathematica'', the problem of the motion of the heavens was finally solved. Newton provided a physical mechanism for Kepler's laws and his law of universal gravitation allowed the anomalies in previous systems, caused by gravitational interaction between the planets, to be resolved. A fundamental difference between Newton's cosmology and those preceding it was the Copernican principle that the bodies on earth obey the same physical laws as all the celestial bodies. This was a crucial philosophical advance in physical cosmology.
Modern scientific cosmology is usually considered to have begun in 1917 with Albert Einstein's publication of his final modification of general relativity in the paper "Cosmological Considerations of the General Theory of Relativity," (although this paper was not widely available outside of Germany until the end of World War I). General relativity prompted cosmogonists such as Willem de Sitter, Karl Schwarzschild and Arthur Eddington to explore the astronomical consequences of the theory, which enhanced the growing ability of astronomers to study very distant objects. Prior to this (and for some time afterwards), physicists assumed that the Universe was static and unchanging.
In parallel to this dynamic approach to cosmology, one long-standing debate about the structure of the cosmos was coming to a climax. Mount Wilson astronomer Harlow Shapley championed the model of a cosmos made up of the Milky Way star system only ; while Heber D. Curtis argued for the idea that spiral nebulae were star systems in their own right - island universes. This difference of ideas came to a climax with the organization of the Great Debate at the meeting of the (US) National Academy of Sciences in Washington on 26 April 1920. The resolution of this debate came with the detection of novae in the Andromeda galaxy by Edwin Hubble in 1923 and 1924. Their distance established spiral nebulae well beyond the edge of the Milky Way and has galaxies of their own.
Subsequent modeling of the universe explored the possibility that the cosmological constant introduced by Einstein in his 1917 paper may result in an expanding universe, depending on its value. Thus the big bang model was proposed by the Belgian priest Georges Lemaître in 1927 which was subsequently corroborated by Edwin Hubble's discovery of the red shift in 1929 and later by the discovery of the cosmic microwave background radiation by Arno Penzias and Robert Woodrow Wilson in 1964. These findings were a first step to rule out some of many alternative physical cosmologies.
Recent observations made by the COBE and WMAP satellites observing this background radiation have effectively, in many scientists' eyes, transformed cosmology from a highly speculative science into a predictive science, as these observations matched predictions made by a theory called Cosmic inflation, which is a modification of the standard big bang model. This has led many to refer to modern times as the "Golden age of cosmology."
In philosophy and metaphysics, cosmology deals with the world as the totality of space, time and all phenomena. Historically, it has had quite a broad scope, and in many cases was founded in religion. The ancient Greeks did not draw a distinction between this use and their model for the cosmos. However, in modern use it addresses questions about the Universe which are beyond the scope of science. It is distinguished from religious cosmology in that it approaches these questions using philosophical methods (e.g. dialectics). Modern metaphysical cosmology tries to address questions such as:
Category:Astrophysics Category:Physical cosmology
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Coordinates | 16°48′″N96°09′″N |
---|---|
Region | Western Philosophy |
Era | 21st-century philosophy |
Color | #B0C4DE |
Name | William Lane Craig |
Birth date | August 23, 1949 |
Birth place | Peoria, Illinois |
School tradition | Analytic Philosophy |
Main interests | Philosophy of religion, Natural theology, Philosophy of time, Christian Apologetics |
Notable ideas | Kalam cosmological argument |
Influences | Alvin Plantinga, Francis Schaeffer, Edward John Carnell, Stuart Hackett, John Hick, Wolfhart Pannenberg |
Influenced | J. P. Moreland, Francis Beckwith }} |
William Lane Craig (born August 23, 1949) is an American Evangelical Christian apologist in the evidentialist tradition. Craig is a prolific debater, philosophical theologian, and analytic philosopher known for his work on the existence of God, defense of Christian theism, philosophy of religion, historicity of Jesus and the philosophy of time. In 1979, he authored ''The Kalam Cosmological Argument'', a defense of the argument of the same name. He is currently a Research Professor of Philosophy at Talbot School of Theology, Biola University.
From 1980 to 1986 he was an Assistant Professor of Philosophy at Trinity Evangelical Divinity School. He briefly held the position of associate professor of Religious Studies at Westmont College, Santa Barbara, California in 1986-1987. Between 1987 and 1994 Craig pursued further research at the University of Leuven, Belgium. Since 1996 he has been a Research Professor of Philosophy at Talbot School of Theology, La Mirada, California.
Craig is a Molinist who embraces a Reformed epistemology and in regard to biological origins is inclined towards progressive creationism, although he concedes the possibility of theistic evolution. He has published on the historicity of the resurrection accounts of Jesus and the philosophy of time for which he advocates a tensed or A-theory of time and a Neo-Lorentzian interpretation of the theory of relativity. He argues for a finely tuned theistic universe, a personal cause of the universe and a theistic objective morality. His work in Christian apologetics includes advocacy of intelligent design, and critiques of "New Atheism," liberal theology, metaphysical naturalism, logical positivism and scientism, postmodernism, anti-realism, moral relativism and subjectivism, Mormonism, Islam, and the methodology and conclusions of the Jesus Seminar.
Category:1949 births Category:Living people Category:Alumni of the University of Birmingham Category:Ludwig Maximilian University of Munich alumni Category:American philosophers Category:American religion academics Category:American theologians Category:Analytic philosophers Category:Biblical scholars Category:Biola University faculty Category:Intelligent design advocates Category:Christian philosophers Category:Christian apologists Category:Christian writers Category:Christian scholars Category:Discovery Institute fellows and advisors Category:Fellows of the International Society for Complexity, Information, and Design Category:Philosophers of religion Category:People from Keokuk, Iowa Category:American Christians Category:Trinity Evangelical Divinity School alumni Category:Wheaton College (Illinois) alumni
de:William Lane Craig es:William Lane Craig fr:William Lane Craig no:William Lane Craig pl:William Lane Craig pt:William Lane Craig fi:William Lane Craig sv:William Lane CraigThis text is licensed under the Creative Commons CC-BY-SA License. This text was originally published on Wikipedia and was developed by the Wikipedia community.
A life-long abstainer from alcohol, in 1886 he created an Australia-wide sensation by spending a night in the Brisbane lock-up disguised as a drunk, and subsequently reporting the conditions of the cells as "Henry Harris". Lane's father was a drunk who impoverished the family.
With the growth of the Australian labour movement, "Sketcher"'s columns, especially his "Labour Notes" in the ''Evening Telegraph'', increasingly promoted labourist philosophy, and Lane himself attended meetings supporting all manner of popular causes, speaking with his "American twang" against repressive laws and practices and Chinese immigrants.
After becoming the de facto editor of the Courier, Lane departed during November 1887 to found the weekly ''The Boomerang'', "a live newspaper, racy, of the soil", in which pro-worker themes and lurid racism were brought to a fever-pitch by both "Sketcher" and "Lucinda Sharpe". He became a powerful supporter of Emma Miller and Women's suffrage. A strong proponent of Henry George's Single Tax Movement, Lane became increasingly committed to a radically alternative society, and ended his relationship with the ''Boomerang'' due to its private ownership.
In May 1890 he began the community-funded Brisbane weekly ''The Worker'', the rhetoric of which became increasingly threatening towards the employers, the government, and the British Empire itself. The defeat of the 1891 Australian shearers' strike convinced Lane that there would be no real social change without a completely new society, and ''The Worker'' became increasingly devoted to his New Australia utopian idea.
''The Workingman's Paradise'', an allegorical novel written in sympathy with the shearers involved in the 1891 Shearer's Strike, was published under his pseudonym ''John Miller'' in early 1892. In the novel Lane articulated the belief that anarchism is the noblest social philosophy of all. Through the novel's philosopher and main protagonist he relates his belief that society may have to experience a period of State socialism to achieve the ideal of Communist anarchism. Mary Gilmore, later a celebrated Australian writer, said in one of her letters ''"the whole book is true and of historical value as Lane transcribed our conversations as well as those of others"''.
Contriving a division among Australian labour activists between the permanently disaffected and those who later formed the Australian Labor Party, Lane refused the Queensland Government's offer of a grant of land on which to create a utopian settlement, and began an Australia-wide campaign for the creation of a new society elsewhere on the globe, peopled by rugged and sober Australian bushmen and their proud wives.
Eventually Paraguay was decided upon, and Lane and his family and several hundred acolytes from New South Wales, Queensland and South Australia departed Mort Bay in Sydney in the ship ''Royal Tar'' on 1 July 1893.
New Australia soon had its crisis, brought on by the issues of inter-racial relationships (Lane singled out the Guarani as racially taboo) and alcohol. Lane's dictatorial manner soon alienated many in the community, and by the time the second boat-load of utopians arrived from Adelaide a year later, Lane had left with a core of devotees to form a new colony nearby named Cosme.
Eventually Lane became disillusioned with the process, and returned to Australia in 1899.
Category:1861 births Category:1917 deaths Category:Australian anarchists Category:Australian trade unionists Category:Australian journalists Category:New Zealand journalists Category:Old Bristolians Category:People from Bristol Category:Georgists
de:William Lane (Utopist) it:William Lane pl:William LaneThis text is licensed under the Creative Commons CC-BY-SA License. This text was originally published on Wikipedia and was developed by the Wikipedia community.
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