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xenon

(Encyclopedia)xenon zēˈnŏn [key] [Gr.,=strange], gaseous chemical element; symbol Xe; at. no. 54; at. wt. 131.293; m.p. −111.9℃; b.p. −107.1℃; density 5.86 grams per liter at STP; valence usually 0. Xeno...

Calatrava, Santiago

(Encyclopedia)Calatrava, Santiago, 1951–, Spanish architect, grad. Institute of Architecture, Valencia (1974), Federal Institute of Technology, Zürich (Ph.D., 1981). He opened an architectural and engineering pr...

white dwarf

(Encyclopedia)white dwarf, in astronomy, a type of star that is abnormally faint for its white-hot temperature (see mass-luminosity relation). Typically, a white dwarf star has the mass of the sun and the radius of...

Zsigmond, Vilmos

(Encyclopedia)Zsigmond, Vilmos, 1930–2016, Hungarian-American cinematographer. As a film student in Budapest, he and fellow student (and later cinematographer) Laszlo Kovacs secretly filmed the street fighting as...

physics

(Encyclopedia)physics, branch of science traditionally defined as the study of matter, energy, and the relation between them; it was called natural philosophy until the late 19th cent. and is still known by this na...

Kennedy, Joseph Patrick

(Encyclopedia)Kennedy, Joseph Patrick, 1888–1969, U.S. ambassador to Great Britain (1937–40), b. Boston, grad. Harvard, 1912. The founder of an American dynasty, he was the father of nine children, including Jo...

Morris, Robert, 1734–1806, American merchant

(Encyclopedia)Morris, Robert, 1734–1806, American merchant, known as the “financier of the American Revolution,” and signer of the Declaration of Independence, b. Liverpool, England. Morris emigrated to Ameri...

Lowell Observatory

(Encyclopedia)Lowell Observatory, astronomical observatory located in Flagstaff, Ariz.; it was founded in 1894 by Percival Lowell, the American astronomer who popularized the idea that Mars might support intelligen...

Lumet, Sidney

(Encyclopedia)Lumet, Sidney lo͞o-mĕtˈ [key], 1924–2011, one of the great American film directors of the 20th cent., b. Philadelphia. A child actor in New York's Yiddish radio and theater and (1935–41) on Bro...

acceleration

(Encyclopedia)acceleration, change in the velocity of a body with respect to time. Since velocity is a vector quantity, involving both magnitude and direction, acceleration is also a vector. In order to produce an ...