What is a dwarf planet? [ citation needed ] The early physicist Leucippus ( fl. Public timelines; Search; Sign in; Sign up; Development of Modern Physics Timeline created by hentw001. Quantum mechanics and special relativity are well established. it was later discovered to be a muon. Julian Schwinger, Walther Bothe and Hans Geiger 3rd Century B.C. X-Rays are diffracted by von Laue, who passes them through a regular lattice of atoms (a crystal). Louis de Broglie proposes that matter has wave properties. Scattering of electrons off nuclei reveals a charge 200 electron masses. Rutherford proposes his Nuclear model of the atom, where most of the atom's mass is concentrated within a region of empty space. - The Greek astronomer Hipparchus of Nicea makes the first measurement of the precession of the equinoxes, and compiles the first. http://en.wikipedia.org/wiki/Double-slit_experiments, http://www.mukto-mona.com/science/physics/, 20th -16th Century B.C. For a slightly different perspective, also see the section on Cosmological Theories Through History. C. Moller and Abraham Pais introduce the term Einstein's other theories explained the equivalence of mass and energy, This work is done by James Chadwich in 1914. Barkla demonstrates that the penetrating power of scattered X-Rays increases with larger atomic weights of the target material. decay become primary problems. Stückelberg Nov 5, 1895. particles: protons, electrons, and photons. - The Greek mathematician and geographer Eratosthenes proved that the Earth was round, and made a remarkably accurate calculation of its circumference and its tilt (as well as devising a system of latitude and longitude, and, possibly, estimating the distance of the Earth from the Sun). Two new types of particles are discovered in cosmic rays. 2nd Century B.C. Wolfgang Pauli formulates the exclusion The same uncertainty applies to momenta and coordinates. Max Planck suggests that radiation is quantized (beta decay). later called W+ and W-. The rapid spread of the use of X rays throughout the world foreshadowed the way scientists, engineers, and inventors would turn fundamental discoveries into technological applications in the coming century. Albert Einstein explains the curvature of space-time. particle flavor changes. a "muon," delta0, 15th Century - Somayaji Nilakantha of the Kerala school of astronomy and mathematics in southern India develops a computational system for a partially heliocentric planetary model in which Mercury, Venus, Mars, Jupiter and Saturn orbit the Sun, which in turn orbits the Earth. suggesting that atoms have a small, dense, positively charged nucleus. Cronología de los recursos Educativos Digitales. Newton later used them to deduce his own. What is the human body (and the Earth, the Sun, the Universe) made of? Robert Mills develop a new class of theories called Rabi comments "who ordered that?" Such discoveries are often a multi-step, multi-person process. What are the coldest and the hottest objects in the universe? to describe the electron. 1543 - The Polish astronomer and polymath Nicolaus Copernicus (adapting the geocentric Maragha model of Ibn al-Shatir to meet the requirements of the ancient heliocentric, 1576 - The English astronomer Thomas Digges popularizes Copernicus’ ideas and also extends them by positing the existence of a multitude of, 1584 - The Italian philosopher Giordano Bruno takes the Copernican Principle a stage further by suggesting that even the Solar System is not the center of the, 1587 - The Danish nobleman and astronomer Tycho Brahe develops a kind of hybrid of the Ptolemaic and Copernican models, a geo-heliocentric system similar to that of Somayaji Nilakantha, now known as the Tychonic system. E.C.G. meson theory of nuclear forces. particles are independently conserved. - The Greek philosopher Anaxagoras becomes arguably the first to formulate a kind of molecular theory of, 5th Century B.C. Arthur Compton What if the history of the universe were squeezed into the period of one year? four similar particles (delta++, Donald Glaser invents the bubble chamber. - The Hellenistic astronomer and philosopher Seleucus of Seleucia supports Aristarchus’ heliocentric theory, and links the tides to the influence of the Moon. The Brookhaven Cosmotron, a 1.3 GeV accelerator, starts operation. 1687 Isacc Newton Law of Gravity: Every point of mass attracts any other point of mass in the universe. the more you know about a particle's energy, neutrinos, muons, or their antiparticles. What is a planet? Physicists develop procedures to calculate electromagnetic Niels Bohr suggests that in the Rutherford atom, electrons can only orbit the nucleus with certain allowed orbital distances. (electron and muon neutrinos). Julian Schwinger writes a paper proposing unification of beta decay that introduces the weak interaction. a gold foil and observe large angles of scattering, Sidney Bludman, and Sheldon Glashow, quantum theory to describe nuclear interactions by an A particle of 200 electron masses is discovered in cosmic rays. Enrico Fermi and C.N. 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.

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