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Plato
(Encyclopedia)Plato plāˈtō [key], 427?–347 b.c., Greek philosopher. Plato's teachings have been among the most influential in the history of Western civilization. Many of the late dialogues are devoted to te...astrometry
(Encyclopedia)astrometry: see astronomy.mass-luminosity relation
(Encyclopedia)mass-luminosity relation, in astronomy, law stating that the luminosity of a star is proportional to some power of the mass of the star. More massive stars are in general more luminous. For stars on t...stellar structure
(Encyclopedia)stellar structure, physical properties of a star and the processes taking place within it. Except for that of the sun, astronomers must draw their conclusions regarding stellar structure on the basis ...Stratospheric Observatory for Infrared Astronomy
(Encyclopedia)Stratospheric Observatory for Infrared Astronomy: see infrared astronomy. ...Halley, Edmond
(Encyclopedia)Halley, Edmond hălˈē, hôˈlē [key], 1656–1742, English astronomer and mathematician. He is particularly noted as the first astronomer to predict the return of a comet and the first to point out...Matute, Ana María
(Encyclopedia)Matute, Ana María äˈnä märēˈä mäto͞oˈtā [key], 1926–2014, Spanish novelist, b. Barcelona. Much of her fiction, which has been translated into more than 20 languages, reflects her searing...melanin
(Encyclopedia)melanin mĕlˈənĭn [key], water-insoluble polymer of various compounds derived from the amino acid tyrosine. It is one of two pigments found in human skin and hair and adds brown to skin color; the ...Chandrasekhar, Subrahmanyan
(Encyclopedia)Chandrasekhar, Subrahmanyan so͝obˌrəmänˈyən chŭnˌdrəsāˈkər [key], 1910–95, American astrophysicist, b. Lahore, India (now Pakistan). He became a professor at the Univ. of Chicago in 1938...Du Chaillu, Paul Belloni
(Encyclopedia)Du Chaillu, Paul Belloni pōl bĕlōnēˈ dü shāyüˈ [key], c.1831–1903, French-American explorer in Africa. Born probably in Paris, he spent his youth on the west coast of Africa, where his fath...Browse by Subject
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