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thorium

(Encyclopedia)thorium thôrˈēəm [key] [from Thor], radioactive chemical element; symbol Th; at. no. 90; mass number of most stable isotope 232; m.p. about 1,750℃; b.p. about 4,790℃; sp. gr. 11.7 at 20℃; va...

red shift

(Encyclopedia)red shift or redshift, in astronomy, the systematic displacement of individual lines in the spectrum of a celestial object toward the red, or longer wavelength, end of the visible spectrum. The effect...

Presley, Elvis

(Encyclopedia)Presley, Elvis (Elvis Aaron Presley), 1935–77, American popular singer, b. Tupelo, Miss. Exposed to gospel music from childhoo...

Douglas, Kirk

(Encyclopedia)Douglas, Kirk, 1916–2020, American film actor, b. Amsterdam, N.Y., as Issur Danielovitch, later Isadore Demsky. A leading man with a muscular physique and handsome cleft-chin face that made him a na...

Stone, Oliver

(Encyclopedia)Stone, Oliver, 1946–, American filmmaker, screenwriter, and producer, b. New York City, studied filmmaking with Martin Scorsese at New York Univ. (B.F.A., 1971). Stone enlisted (1967) in the army an...

radioactivity

(Encyclopedia)CE5 Effects of a magnetic field on the products of radioactivity CE5 Disintegration series: Radioactive decay of radium-226 into lead-206 radioactivity, spontaneous disintegration or decay of t...

latitude

(Encyclopedia)latitude, angular distance of any point on the surface of the earth north or south of the equator. The equator is latitude 0°, and the North Pole and South Pole are latitudes 90°N and 90°S, respect...

Know-Nothing movement

(Encyclopedia)Know-Nothing movement, in U.S. history. The increasing rate of immigration in the 1840s encouraged nativism. In Eastern cities where Roman Catholic immigrants especially had concentrated and were welc...

DeLillo, Don

(Encyclopedia)DeLillo, Don dəlĭlˈō [key], 1936–, American novelist, b. New York City, grad. Fordham (1958). DeLillo is an accomplished prose stylist with a dark vision and mordant wit. In a steady stream of n...

transit

(Encyclopedia)transit, in astronomy, passage of a body across a meridian or passage of a small body across the visible disk of a larger one. (The passage of a large body across a smaller one is called an eclipse or...