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galaxy

(Encyclopedia)CE5 Hubble classification of galaxies: Elliptical galaxies (E) are classified according to the degree of flattening of the ellipse. Spiral galaxies (S) and barred spiral galaxies (SB) are classifie...

star

(Encyclopedia)star, hot incandescent sphere of gas, held together by its own gravitation, and emitting light and other forms of electromagnetic radiation whose ultimate source is nuclear energy. The universe co...

science

(Encyclopedia)science [Lat. scientia=knowledge]. For many the term science refers to the organized body of knowledge concerning the physical world, both animate and inanimate, but a proper definition would also hav...

communication

(Encyclopedia)communication, transfer of information, such as thoughts and messages, as contrasted with transportation, the transfer of goods and persons (see information theory). The basic forms of communication a...

Hertzsprung-Russell diagram

(Encyclopedia)CE5 The Hertzsprung-Russell diagram shows the relation between the luminosity and surface temperature (which is related to spectral class, or color) of the stars in the Milky Way. Most stars fall a...

seafloor spreading

(Encyclopedia)CE5 Schematic model of the oceanic crust, showing seafloor spreading seafloor spreading, theory of lithospheric evolution that holds that the ocean floors are spreading outward from vast underwate...

procedure

(Encyclopedia)procedure, in law, the rules that govern the obtaining of legal redress. This article deals only with civil procedure in Anglo-American law (for criminal procedure, see criminal law). Except for evide...

Hindu philosophy

(Encyclopedia)Hindu philosophy, the philosophical speculations and systems of India that have their roots in Hinduism. Nyaya, traditionally founded by Akshapada Gautama (6th cent. b.c.), is a school of logic and...

Montreal

(Encyclopedia)Montreal môNrāälˈ [key], city (1991 pop. 1,017,666), S Que., Canada, on Montreal island, surrounded by St. Lawrence River and Rivière des Prairies. Montreal is the second largest metropolitan are...

Sufism

(Encyclopedia)Sufism so͞oˈfĭzəm [key], an umbrella term for the ascetic and mystical movements within Islam. While Sufism is said to have incorporated elements of Christian monasticism, gnosticism, and Indian m...