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Duquesne
(Encyclopedia)Duquesne dəkānˈ, do͞o–, dyo͞o– [key], city (2020 pop. 5,589), Allegheny co.,...East Lyme
(Encyclopedia)East Lyme līm [key], town (1990 est. pop. 14,000), New London co., SE Conn., on Long Island Sound; settled c.1660, inc. 1839. The town has diversified light industry. Its many colonial buildings incl...Hawthorne
(Encyclopedia)Hawthorne. 1 City (2020 pop. 88,083), Los Angeles co., S Calif., a suburb of Los Angeles; inc. 1922. Located in an oil- and gas-producing area, ...Hall, Edward
(Encyclopedia)Hall, Edward, 1499?–1547, English chronicler. He wrote The Union of the Noble and Ilustre Famelies of Lancastre and York (1548), usually called Hall's Chronicle. A glorification of the Tudors, it is...Timaru
(Encyclopedia)Timaru tĭmˈəro͞o [key], city (1996 pop. 27,323), E central South Island, New Zealand, on the Pacific Ocean. It is the main port for the S Canterbury Plains. Frozen meats and other products are exp...noise
(Encyclopedia)noise, any signal that does not convey useful information. Electrical noise consists of electrical currents or voltages that interfere with the operation of electronic systems. Electrical noise limits...corona, in astronomy
(Encyclopedia)corona, luminous envelope surrounding the sun, outside the chromosphere. Its density is less than one billionth that of the earth's atmosphere. The corona is visible only at the time of totality durin...relativity
(Encyclopedia)relativity, physical theory, introduced by Albert Einstein, that discards the concept of absolute motion and instead treats only relative motion between two systems or frames of reference. One consequ...chlorofluorocarbons
(Encyclopedia)chlorofluorocarbons klōrˌəflo͝orˈəkärˌbənz, klôrˌ– [key] (CFCs), organic compounds that contain carbon, chlorine, and fluorine atoms. CFCs are highly effective refrigerants that were deve...Ring nebula
(Encyclopedia)Ring nebula, planetary nebula in the northern constellation Lyra; cataloged as M57 or NGC 6720. It is perhaps the most famous and beautiful nebula of this type. Its name describes the appearance of th...Browse by Subject
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