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Eddington, Sir Arthur Stanley

(Encyclopedia)Eddington, Sir Arthur Stanley, 1882–1944, British astronomer and physicist. He was chief assistant (1906–13) at the Royal Observatory, Greenwich, and was from 1913 Plumian professor of astronomy a...

brown dwarf

(Encyclopedia)brown dwarf, in astronomy, celestial body that is larger than a planet but does not have sufficient mass to convert hydrogen into helium via nuclear fusion as stars do. Also called “failed stars,”...

United Nations Atomic Energy Commission

(Encyclopedia)United Nations Atomic Energy Commission: see disarmament, nuclear. ...

conservation laws

(Encyclopedia)conservation laws, in physics, basic laws that together determine which processes can or cannot occur in nature; each law maintains that the total value of the quantity governed by that law, e.g., mas...

Englert, François

(Encyclopedia)Englert, François, 1932–, Belgian theoretical physicist, Ph.D. Université libre de Bruxelles (U.L.B.), Brussels, 1959. He has been a professor at U.L.B. since 1964. Englert was the recipient, join...

Boyle, Robert

(Encyclopedia)Boyle, Robert, 1627–91, Anglo-Irish physicist and chemist. The seventh son of the 1st earl of Cork, he was educated at Eton and on the Continent and conducted most of his researches at his own labor...

tachyon

(Encyclopedia)tachyon tăkˈēŏnˌ [key], hypothetical elementary particle that travels only at speeds exceeding that of light. According to the theory of relativity, the speed of light is the limiting velocity fo...

nitrogen cycle

(Encyclopedia)CE5 Nitrogen cycle nitrogen cycle, the continuous flow of nitrogen through the biosphere by the processes of nitrogen fixation, ammonification (decay), nitrification, and denitrification. Nitrogen...

Charles III, king of Spain, and of Naples and Sicily

(Encyclopedia)Charles III, 1716–88, king of Spain (1759–88) and of Naples and Sicily (1735–59), son of Philip V and Elizabeth Farnese. Recognized as duke of Parma and Piacenza in 1731, he relinquished the duc...

Hansen, Lars Peter

(Encyclopedia)Hansen, Lars Peter, 1952–, U.S. economist, b. Champaign, Ill., Ph.D. Univ. of Minnesota, 1978. After teaching at Carnegie-Mellon Univ., Pittsburgh (1978–81), he joined the faculty of the Univ. of ...