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Frederick II, Holy Roman emperor and German king

(Encyclopedia)Frederick II, 1194–1250, Holy Roman emperor (1220–50) and German king (1212–20), king of Sicily (1197–1250), and king of Jerusalem (1229–50), son of Holy Roman Emperor Henry VI and of Consta...

cosmology

(Encyclopedia)cosmology, area of science that aims at a comprehensive theory of the structure and evolution of the entire physical universe. The earliest pre-Ptolemaic theories assumed that the earth was the cent...

comet

(Encyclopedia)CE5 Comet: Whatever the direction of a comet's flight, its “tail” always points away from the sun. The tail disappears when the comet is far from the sun. comet [Gr.,=longhaired], a small cele...

radio

(Encyclopedia)CE5 A. AM transmitter B. AM receiver radio, transmission or reception of electromagnetic radiation in the radio frequency range. The term is commonly applied also to the equipment used, especially...

mathematics

(Encyclopedia)mathematics, deductive study of numbers, geometry, and various abstract constructs, or structures; the latter often “abstract” the features common to several models derived from the empirical, or ...

Renaissance

(Encyclopedia)Renaissance rĕnəsänsˈ, –zänsˈ [key] [Fr.,=rebirth], term used to describe the development of Western civilization that marked the transition from medieval to modern times. This article is conc...

philosophy

(Encyclopedia)philosophy [Gr.,=love of wisdom], study of the ultimate reality, causes, and principles underlying being and thinking. It has many aspects and different manifestations according to the problems involv...

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...

photography, still

(Encyclopedia)photography, still, science and art of making permanent images on light-sensitive materials. See also photographic processing; motion picture photography; motion pictures. By the end of ...

China

(Encyclopedia)CE5 CE5 China, Mandarin Zhonghua Renmin Gongheguo [central glorious people's united country; i.e., people's republic], officially People's Repu...