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air, law of the

(Encyclopedia)air, law of the, in the broadest sense, all law connected with the use of the air, including radio and satellite transmissions; more commonly, it refers to laws concerning civil aviation. The developm...

twilight

(Encyclopedia)twilight, period between sunset and total darkness or between total darkness and sunrise. Total darkness does not occur immediately when the sun sinks below the horizon because light from the sun that...

fiber optics

(Encyclopedia)fiber optics, transmission of digitized messages or information by light pulses along hair-thin glass or plastic fibers. Each fiber is surrounded by a cladding having a high index of refractance so th...

Murray, cities, United States

(Encyclopedia)Murray. 1 City (1990 pop. 14,439), seat of Calloway co., SW Ky., near the Tenn. line; inc. 1844. There is light manufacturing. Tobacco and grain are grown, livestock and poultry are raised, and there ...

Baruch, book of the Septuagint and of the Apocrypha

(Encyclopedia)Baruch, early Jewish book included in the Septuagint, but not included in the Hebrew Bible and placed in the Apocrypha in the Authorized Version. It is named for a Jewish prince Baruch (fl. 600 b.c.),...

Milky Way

(Encyclopedia)CE5 Position of the sun in the Milky Way Milky Way, the galaxy of which the sun and solar system are a part, seen as a broad band of light arching across the night sky from horizon to horizon; if ...

neutrino astronomy

(Encyclopedia)neutrino astronomy, study of stars by means of their emission of neutrinos, fundamental particles that result from nuclear reactions and are emitted by stars along with light. Approximately 100 billio...

Favart, Charles Simon

(Encyclopedia)Favart, Charles Simon shärl sēmôNˈ fävärˈ [key], 1710–92, French dramatist and theatrical manager, for a time director of the Opéra-Comique. He was the originator of the modern light opera a...

cat's-eye

(Encyclopedia)cat's-eye, gemstone that displays a thin band of reflected light on its surface when cut as a cabochon. Its name is derived from its supposed resemblance to the eye of a cat. The optical effect, known...

Arabian horse

(Encyclopedia)Arabian horse, breed of light horse developed in Mesopotamia and N Africa, and probably the first true domesticated breed. Prized since earliest times for its superior beauty, spirit, speed, grace of ...