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Halley's comet
(Encyclopedia) Halley's comet or Comet HalleyHalley's comethălˈē, hāˈlē [key], periodic comet named for Edmond Halley, who observed it in 1682 and identified it as the one observed in 1531 and 1607.…holmium
(Encyclopedia) holmiumholmiumhōlˈmēəm [key] [Lat.,=Stockholm], metallic chemical element; symbol Ho; at. no. 67; at. wt. 164.93032; m.p. about 1,474℃; b.p. about 2,425℃; sp. gr. 8.78 at 25℃; valence…Intergovernmental Panel on Climate Change
(Encyclopedia) Intergovernmental Panel on Climate Change (IPCC), scientific panel created (1988) by two United Nations organizations, the UN Environment Program and the World Meteorological…Landrum-Griffin Act
(Encyclopedia) Landrum-Griffin Act, 1959, passed by the U.S. Congress, officially known as the Labor-Management Reporting and Disclosure Act. It resulted from hearings of the Senate committee on…Thomson, James , 1834–82, Scottish poet and essayist
(Encyclopedia) Thomson, James, 1834–82, Scottish poet and essayist. He is remembered for his darkly pessimistic poem The City of Dreadful Night. He was raised in an orphan asylum and became (1851) an…polycythemia
(Encyclopedia) polycythemiapolycythemiapŏlˌēsīthēˈmēə [key], condition characterized by an increase in the production of red blood cells, or erythrocytes, in the blood. Primary polycythemia, also…sertão
(Encyclopedia) sertãosertãosərˈtouN [key] [Port.,=backlands], semiarid hinterland of NE Brazil; c.250,000 sq mi (647,500 sq km). Its characteristic landscape is the caatinga, or thorny scrub forest.…harmonic motion
(Encyclopedia) CE5 Harmonic motion is exhibited by a weight vibrating on the end of a spring. In A, the displacement of the object from its equilibrium position and the acceleration of the object…binary star
(Encyclopedia) CE5 A. Eclipsing binary: Primary component passing behind secondary (dimmer) component B. Light curve for eclipsing binary binary star or binary system, pair of stars that are held…census
(Encyclopedia) census, periodic official count of the number of persons and their condition and of the resources of a country. In ancient times, among the Jews and Romans, such enumeration was mainly…Trending
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