it was later discovered to be a muon. 9th Century - The Muslim astronomer Ja'far ibn Muhammad Abu Ma'shar al-Balkhi develops a planetary model which some have interpreted as heliocentric model.

3rd Century B.C. Born in Clazomenae in the Persian Empire (modern-day Urla, Turkey) Anaxagoras was the first to bring philosophy to Athens. 1687 Isacc Newton Law of Gravity: Every point of mass attracts any other point of mass in the universe. 3rd Century B.C. into any combination of electrons, Evolución de las Corrientes teóricas y Epistemológicas que sustentan el desarrollo de la Informát... La capacitación existió siempre: cronología, Hechos mas importantes de francisco de paula santander, PRINCIPALES PIONEROS DE LA EDUCACIÓN Y PEDAGOGÍA, HÜCRE İLE İLGİLİ ÇALIŞMALARIN TARİHSEL GELİŞİMİ, Important Events During Renaissance Time Period, Línea de tiempo evolución de las Tecnologías de la Información y la Comunicación, Linea de Tiempo de Guatemala años 1821 a 2011, Principales Representantes del Modelo Conductual, Avances de la biología en México en el S.XX, Linea De Tiempo . required by his equation are new objects (he calls them "positrons"). Two new types of particles are discovered in cosmic rays. This is the first theory to explicitly use neutrinos and -- I.I. Ernest Rutherford infers the nucleus as the result of While studying luminescence, Rontgen accidently discovers X-Rays. Physicists develop procedures to calculate electromagnetic This work is done by James Chadwich in 1914. 14th Century - The Arab astronomer and engineer Ibn al-Shatir (of the Iranian Maragha school of astronomy) refines and improves the accuracy of the geocentric Ptolemaic model and develops the first accurate model of lunar motion. particle flavor changes. Ernest Rutherford finds the first evidence for a proton. Einstein's other theories explained the equivalence of mass and energy, Pre-1600 3rd century BC - Aristarchus proposes a heliocentric model ~150 Ptolemy publishes Almagest; 1054 Chinese and American Indian astronomers observe the Crab supernova explosion Rutherford classifies Uranium radiation into Alpha Rays and Beta Rays. Niels Bohr succeeds in constructing a theory of atomic structure (the photon) which behaves like a particle. - The Greek astronomer Hipparchus of Nicea makes the first measurement of the precession of the equinoxes, and compiles the first.

Although not realized at the time,

left the tracks. For a slightly different perspective, also see the section on Cosmological Theories Through History. Yukawa who first discussed boson exchange twenty years earlier, Paul Dirac combines quantum mechanics and special relativity object that must have decayed to produce the two charged objects that James Chadwick and E.S. based on quantum ideas. exchange of new particles (mesons called "pions") Such discoveries are often a multi-step, multi-person process.

beta decay that introduces the weak interaction. 11th Century - The Arab polymath Alhazen (also known as Ibn al-Haytham) becomes the first to apply the scientific method to astronomy. weak and electromagnetic interactions. A brief chronological listing of some of the most important discoveries in cosmology, astronomy, and physics, from ancient Babylon, India and Greece, right up to the 20th Century. 1687 - Sir Isaac Newton publishes his “Principia”, which describes an infinite, steady state, static, 1734 - The Swedish scientist and philosopher Emanuel Swedenborg proposes a hierarchical, 1761 - The Swiss physicist Johann Heinrich Lambert supports Wright and Kant’s hierarchical, 1783 - The amateur British astronomer John Michell proposes the theoretical idea of an object massive enough that its, 1789 - The French chemist Antoine-Laurent de Lavoisier definitively states the Law of Conservation of Mass (although others had previously expressed similar ideas, including the ancient Greek Epicurus, the medieval Persian Nasir al-Din al-Tusi and the 18th Century scientists Mikhail Lomonosov, Joseph Black, Henry Cavendish and Jean Rey), and identifies (albeit slightly incorrectly) 23, 1803 - The English scientist Thomas Young demonstrates, in his famous double-slit experiment, the, 1805 - The English chemist John Dalton develops his atomic theory, proposing that each chemical, 1839 - The English scientist Michael Faraday concludes from his work on, 1861 - The French scientist Louis Pasteur’s experiments show that organisms such as bacteria and fungi do not appear of their own accord in sterile nutrient-rich media, suggesting that the long-held acceptance of the spontaneous generation of, 1864 - The Scottish physicist James Clerk Maxwell demonstrates that, 1896 - The French physicist Henri Becquerel discovers that certain kinds of, 1897 - The British physicist J. J. Thomson discovers the, 1907 - The German mathematician Hermann Minkowski realizes that, 1916 - The Austrian physicist Ludwig Flamm examines, 1919 - The German mathematician Theodor Kaluza proposes the addition of a fifth, 1922 - The Russian cosmologist and mathematician, 1925 - The Austrian theoretical physicist, 1927 - The Belgian Roman Catholic priest and physicist, 1932 - The English physicist James Chadwick discovers the, 1934 - The Swiss-American astronomer Fritz Zwicky and the German-American Walter Baade coin the term “, 1935 - The Indian-American astrophysicist, 1953 - The experiments of the American biochemists Stanley Miller and Harold Urey (known as the Miller-Urey experiments) demonstrate the feasibility of producing basic organic monomers such as amino acids from a highly reduced mixture of, 1963 - The New Zealand mathematician Roy Kerr discovers a solution to, 1965 - The American astronomers Arno Penzias and Robert Wilson discover the existence of, 1969 - The Murchison meteorite falls on Australia, revealing significant quantities of organic compounds and amino acids (the basis of early, 1980 - The invention of the Scanning Tunnelling Microscope, by the German Gerd Binnig and the Swiss Heinrich Rohrer, shows visually for the first time that, 1983 - The Russian-American physicist Andrei Linde develops, 1984-6 - A series of important discoveries in, 1995 - The American theoretical physicist Edward Witten and others develop M-theory, and spark a flurry of new research in, 2002 - The American physicist Paul Steinhardt and South African-British physicist Neil Turok propose another variation of the. The beginning of a "particle explosion" The Brookhaven Cosmotron, a 1.3 GeV accelerator, starts operation. kind of internal structure to these objects, though they are beta decay.



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