1939 In Science
The year 1939 in science and technology involved some significant events, listed below. Astronomy * Robert Oppenheimer jointly predicts two new types of celestial object: ** With George Volkoff, he calculates the structure of neutron stars. ** With Hartland Snyder, he predicts the existence of what will come to be called black holes. Biology * Autumn – DDT's properties as an insecticide are discovered by Paul Hermann Müller, Paul Müller of Novartis#History, Geigy. Cartography * Kavrayskiy VII projection devised by Vladimir V. Kavrayskiy. Chemistry * January 7 – French physicist Marguerite Perey identifies francium, the Timeline of chemical element discoveries, last chemical element first discovered in nature, as a decay product of 227Ac. * April 30 – Nylon fabric is first introduced to the general public at the 1939 New York World's Fair, New York World's Fair. * July – Edward Adelbert Doisy of Saint Louis University publishes the chemical structure of vitamin K. * ...
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