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Atget, Eugène

(Encyclopedia) Atget, EugèneAtget, Eugèneözhĕnˈ ätzhĕˈ [key], 1857–1927, French photographer. After working as a sailor and then as an actor for many years, Atget became a photographer at the age of…

Ascension, island

(Encyclopedia) Ascension Ascension əsĕnˈchən [key], island, 34 sq mi (88 sq km), in the S Atlantic, NW of Saint Helena and belonging to the British St. Helena overseas…

magnetron

(Encyclopedia) magnetronmagnetronmăgˈnĭtrŏnˌ [key], vacuum tube oscillator (see electron tube) that generates high-power electromagnetic signals in the microwave frequency range. Its operation is…

fog

(Encyclopedia) fog, aggregation of water droplets or ice crystals immediately above the surface of the earth (i.e., a cloud near the ground). A light or thin fog is usually called a mist. Fog may…

Bezos, Jeffrey Preston

(Encyclopedia) Bezos, Jeffrey PrestonBezos, Jeffrey Prestonbāˈzōs [key], 1964– American business executive and on-line retailing pioneer, b. Albuquerque, N.M., grad. Princeton (B.S.E., 1986). He…

chaos theory

(Encyclopedia) chaos theory, in mathematics, physics, and other fields, a set of ideas that attempts to reveal structure in aperiodic, unpredictable dynamic systems such as cloud formation or the…

hail, in meteorology

(Encyclopedia) hail, precipitation in the form of pellets composed of ice or of ice and snow, occurring at any time of the year, usually during the passage of a cold front or during a thunderstorm.…

radar astronomy

(Encyclopedia) radar astronomy, application of radar to the determination of distances and planetary features within the solar system, such as rotation rates. A short burst of radio waves is…

Rosenquist, James

(Encyclopedia) Rosenquist, James, 1933–2017, American painter, b. Grand Forks, N.Dak., studied Univ. of Minnesota (1952–54), Art Students League, New York City (1955). An important figure in the pop…