|"The Reverend "Monsignor
17 July 1894|
|Died||20 June 1966
|Alma mater||"Catholic University of Leuven
"St Edmund's House, Cambridge
"Massachusetts Institute of Technology
|Known for||"Theory of the expansion of the universe
"Big Bang theory
|Awards||"Francqui Prize (1934)
"Eddington Medal (1953)
|Institutions||"Catholic University of Leuven|
|"Doctoral advisor||"Charles Jean de la Vallée-Poussin (Leuven)
"Arthur Eddington (Cambridge)
"Harlow Shapley (MIT)
|Doctoral students||Louis Philippe Bouckaert, Rene van der Borght|
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Georges Henri Joseph Édouard Lemaître, "RAS Associate (French: "[ʒɔʁʒᵊ ləmɛ:tʁᵊ] ("" listen); 17 July 1894 – 20 June 1966) was a Belgian "Catholic Priest, "astronomer and professor of "physics at the "Catholic University of Leuven. He proposed on theoretical grounds that the "universe is expanding, which was observationally confirmed soon afterwards by "Edwin Hubble. He was the first to derive what is now known as "Hubble's law and made the first estimation of what is now called the "Hubble constant, which he published in 1927, two years before Hubble's article. Lemaître also proposed what became known as the "Big Bang theory of the origin of the "universe, which he called his "hypothesis of the "primeval atom" or the "Cosmic Egg".
After a classical education at a "Jesuit secondary school, the Collège du Sacré-Coeur, in "Charleroi, Lemaître began studying "civil engineering at the "Catholic University of Leuven at the age of 17. In 1914, he interrupted his studies to serve as an artillery officer in the "Belgian army for the duration of "World War I. At the end of hostilities, he received the Belgian "War Cross with palms.
After the war, he studied "physics and "mathematics, and began to prepare for the "diocesan "priesthood, not for the Jesuits. He obtained his "doctorate in 1920 with a thesis entitled l'Approximation des fonctions de plusieurs variables réelles (Approximation of functions of several real variables), written under the direction of "Charles de la Vallée-Poussin. He was "ordained a "priest in 1923.
In 1923, he became a graduate student in astronomy at the "University of Cambridge, spending a year at St Edmund's House (now "St Edmund's College, Cambridge). He worked with "Arthur Eddington, who introduced him to modern "cosmology, "stellar astronomy, and "numerical analysis. He spent the next year at "Harvard College Observatory in "Cambridge, Massachusetts, with "Harlow Shapley, who had just gained renown for his work on "nebulae, and at the "Massachusetts Institute of Technology (MIT), where he registered for the doctoral program in sciences.
In 1925, on his return to Belgium, he became a part-time lecturer at the Catholic University of Leuven. He then began the report which brought him international fame when he published it in 1927 in the Annales de la Société Scientifique de Bruxelles (Annals of the Scientific Society of Brussels) under the title "Un Univers homogène de masse constante et de rayon croissant rendant compte de la vitesse radiale des nébuleuses extragalactiques" ("A homogeneous Universe of constant mass and growing radius accounting for the radial velocity of extragalactic nebulae"). In this report, he presented his new idea of an expanding universe, derived from General Relativity and later known as "Hubble's law, and provided the first observational estimation of the "Hubble constant but not yet that of the primeval atom. Instead, the initial state was taken as Einstein's own finite-size static universe model. The paper had little impact because the journal in which it was published was not widely read by astronomers outside Belgium; Arthur Eddington reportedly helped translate his article into English in 1931, but the part of it pertaining to the estimation of the "Hubble constant" was not included in the translation for reasons that remained unknown for long time. This issue was clarified in 2011 by Mario Livio.
At this time, "Einstein, while not taking exception to the mathematics of Lemaître's theory, refused to accept the idea of an expanding universe; Lemaître recalled him commenting "Vos calculs sont corrects, mais votre physique est abominable" ("Your calculations are correct, but your physics is atrocious.") The same year, Lemaître returned to MIT to present his doctoral thesis on The gravitational field in a fluid sphere of uniform invariant density according to the theory of relativity. Upon obtaining his Ph.D., he was named "ordinary professor at the Catholic University of Leuven.
In 1930, Eddington published in the "Monthly Notices of the Royal Astronomical Society a long commentary on Lemaître's 1927 article, in which he described the latter as a "brilliant solution" to the outstanding problems of cosmology. The original paper was published in an abbreviated English translation in 1931, along with a sequel by Lemaître responding to Eddington's comments. Lemaître was then invited to London to participate in a meeting of the "British Association on the relation between the physical universe and spirituality. There he proposed that the universe expanded from an initial point, which he called the "Primeval Atom". He developed this idea in a report published in "Nature. Lemaître himself also described his theory as "the Cosmic Egg exploding at the moment of the creation"; it became better known as the "Big Bang theory," a pejorative term coined during a 1949 BBC radio broadcast by the astronomer "Fred Hoyle, who was then still a proponent of the steady state universe and remained so until his death in 2001.
Lemaître's proposal met with "skepticism from his fellow scientists. Eddington found Lemaître's notion unpleasant. Einstein found it suspect because he deemed it unjustifiable from a physical point of view. On the other hand, Einstein encouraged Lemaître to look into the possibility of models of non-isotropic expansion, so it is clear he was not altogether dismissive of the concept. He also appreciated Lemaître's argument that a static-Einstein model of the universe could not be sustained infinitely into the past.
In January 1933, Lemaître and Einstein, who had met on three occasions—in 1927 in "Brussels, at the time of a "Solvay Conference, in 1932 in Belgium, at the time of a cycle of conferences in Brussels, and in 1935 at "Princeton—traveled together to attend a series of seminars in California. After Lemaître detailed his theory, Einstein stood up, applauded, and is supposed to have said, "This is the most beautiful and satisfactory explanation of creation to which I have ever listened." However, there is disagreement over the reporting of this quote in the newspapers of the time, and it may be that Einstein was not actually referring to the theory as a whole but to Lemaître's proposal that "cosmic rays may in fact be the leftover artifacts of the initial "explosion". Later research on cosmic rays by "Robert Millikan undercut this proposal.
In 1933, when he resumed his theory of the expanding universe and published a more detailed version in the Annals of the Scientific Society of Brussels, Lemaître achieved his greatest public recognition. Newspapers around the world called him a famous Belgian scientist and described him as the leader of the new cosmological physics.
In 1936, he was elected a member of the "Pontifical Academy of Sciences. He took an active role there, and served as its president from March 1960 until his death. During the "Second Vatican Council he was asked to serve on the first special commission to examine the question of contraception. However, since his health made it impossible for him to travel to Rome – he had suffered a heart attack in December 1964 – Lemaître demurred, expressing his surprise that he was even chosen. He told a "Dominican colleague, Père Henri de Riedmatten, that he thought it was dangerous for a mathematician to venture outside of his area of expertise. He was also named "prelate ("Monsignor) in 1960 by "Pope John XXIII.
In 1946, he published his book on L'Hypothèse de l'Atome Primitif (The Primeval Atom Hypothesis). It was translated into Spanish in the same year and into English in 1950.["citation needed]
By 1951, "Pope Pius XII declared that Lemaître's theory provided a scientific validation for "Catholicism. However, Lemaître resented the Pope's proclamation, stating that the theory was neutral and there was neither a connection nor a contradiction between his religion and his theory. When Lemaître and Daniel O'Connell, the Pope's science advisor, tried to persuade the Pope not to mention Creationism publicly anymore, the Pope agreed. He persuaded the Pope to stop making proclamations about cosmology. While a devout Roman Catholic, he was against mixing science with religion, though he also was of the opinion that these two fields of human experience were not in conflict.
During the 1950s, he gradually gave up part of his teaching workload, ending it completely when he took "emeritus status in 1964.
At the end of his life, he was increasingly devoted to problems of numerical calculation. He was in fact a remarkable "algebraicist and arithmetical calculator. Since 1930, he used the most powerful calculating machines of the time, the "Mercedes. In 1958 he was introduced to the University's "Burroughs E 101, its first electronic computer. Lemaître maintained a strong interest in the development of computers and, even more, in the problems of "language and "computer programming.
He died on 20 June 1966, shortly after having learned of the discovery of "cosmic microwave background radiation, which provided further evidence for his proposal about the birth of the universe.
In 2005, Lemaître was voted to the 61st place of "De Grootste Belg ("The Greatest Belgian"), a "Flemish television program on the "VRT. In the same year he was voted to the 78th place by the audience of the "Les plus grands Belges ("The Greatest Belgians"), a television show of the "RTBF.
Lemaître was a pioneer in applying "Albert Einstein's theory of "general relativity to "cosmology. In a 1927 article, which preceded "Edwin Hubble's landmark article by two years, Lemaître derived what became known as "Hubble's law and proposed it as a generic phenomenon in relativistic cosmology. Lemaître also estimated the numerical value of the "Hubble constant. However, the data used by Lemaître did not allow him to prove that there was an actual linear relation, which Hubble did two years later.
Einstein was skeptical of this paper. When Lemaître approached Einstein at the 1927 "Solvay Conference, the latter pointed out that "Alexander Friedmann had proposed a similar solution to Einstein's equations in 1922, implying that the radius of the universe increased over time. (Einstein had also criticized Friedmann's calculations, but withdrew his comments.) In 1931, his "annus mirabilis, Lemaître published an article in "Nature setting out his theory of the "primeval atom."
Friedmann was handicapped by living and working in the "USSR, and died in 1925, soon after inventing the "Friedmann–Lemaître–Robertson–Walker metric. Because Lemaître spent his entire career in Europe, his scientific work is not as well known in the United States as that of Hubble or Einstein, both well known in the U.S. by virtue of residing there. Nevertheless, Lemaître's theory changed the course of cosmology. This was because Lemaître:
Both Friedmann and Lemaître proposed relativistic cosmologies featuring an expanding universe. However, Lemaître was the first to propose that the expansion explains the "redshift of galaxies. He further concluded that an initial ""creation-like" event must have occurred. In the 1980s, "Alan Guth and "Andrei Linde modified this theory by adding to it a period of "inflation.
Einstein at first dismissed Friedmann, and then (privately) Lemaître, out of hand, saying that not all mathematics lead to correct theories. After Hubble's discovery was published, Einstein quickly and publicly endorsed Lemaître's theory, helping both the theory and its proposer get fast recognition.
Lemaître was also an early adopter of computers for cosmological calculations. He introduced the first computer to his university (a Burroughs E101) in 1958 and was one of the inventors of the "Fast Fourier transform algorithm.
In 1931, Lemaitre was the first scientist to propose the expansion of the universe was actually accelerating which was confirmed observationally in the 1990s through observations of very distant Type IA supernova with the Hubble Space Telescope.
In 1948 Lemaître published a polished mathematical essay "Quaternions et espace elliptique" which clarified an obscure space. "William Kingdon Clifford had cryptically described "elliptic space in 1873 at a time when "versors were too common to mention. Lemaître developed the theory of quaternions from first principles so that his essay can stand on its own, but he recalled the "Erlangen program in geometry while developing the metric geometry of elliptic space. "H. S. M. Coxeter, another contributor to elliptic geometry, summarized Lemaître's work for "Mathematical Reviews.
On 17 March 1934, Lemaître received the "Francqui Prize, the highest Belgian scientific distinction, from "King Léopold III. His proposers were Albert Einstein, Charles de la Vallée-Poussin and Alexandre de Hemptinne. The members of the international jury were Eddington, "Langevin, "Théophile de Donder and Marcel Dehalu.
Another distinction that the Belgian government reserves for exceptional scientists was allotted to him in 1950: the decennial prize for applied sciences for the period 1933–1942.["citation needed]
Indeed the attempt in 1951 by Pope Pius XII to look forward to a time when creation would be established by science was resented by several physicists, notably by George Gamow and even George Lemaitre, a member of the Pontifical Academy.
It is tempting to think that Lemaître's deeply-held religious beliefs might have led him to the notion of a beginning of time. After all, the Judeo-Christian tradition had propagated a similar idea for millennia. Yet Lemaître clearly insisted that there was neither a connection nor a conflict between his religion and his science. Rather he kept them entirely separate, treating them as different, parallel interpretations of the world, both of which he believed with personal conviction. Indeed, when Pope Pius XII referred to the new theory of the origin of the universe as a scientific validation of the Catholic faith, Lemaître was rather alarmed.
Lemaître was determined to discourage the Pope from making proclamations about cosmology, partly to halt the embarrassment that was being caused to supporters of the Big Bang, but also to avoid any potential difficulties for the Church. ...Lemaître contacted Daniel O'Connell, director of the Vatican Observatory and the Pope's science advisor, and suggested that together they try to persuade the Pope to keep quiet on cosmology. The Pope was surprisingly compliant and agreed to the request–the Big Bang would no longer be a matter suitable for Papal addresses.
It was Lemaître's firm belief that scientific endeavour should stand isolated from the religious realm. With specific regard to his Big Bang theory, he commented: 'As far as I can see, such a theory remains entirely outside any metaphysical or religious question.' Lemaître had always been careful to keep his parallel careers in cosmology and theology on separate tracks, in the belief that one led him to a clearer comprehension of the material world, while the other led to a greater understanding of the spiritual realm.... Not surprisingly, he was frustrated and annoyed by the Pope's deliberate mixing of theology and cosmology. One student who saw Lemaître upon his return from hearing the Pope's address to the Academy recalled him 'storming into class...his usual jocularity entirely missing'.