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X-ray astronomy

(Encyclopedia)X-ray astronomy, study of celestial objects by means of the X rays they emit, in the wavelength range from 0.01 to 10 nanometers. X-ray astronomy dates to 1949 with the discovery that the sun emits X ...

Draper, John William

(Encyclopedia)Draper, John William, 1811–82, American scientist, philosopher, and historian, b. near Liverpool, England, M.D. Univ. of Pennsylvania, 1836. In 1839 he became professor of chemistry at the Univ. of ...

Fox Quesada, Vicente

(Encyclopedia)Fox Quesada, Vicente vēsānˈtā fōks kāsäˈᵺä [key], 1942–, Mexican political leader, president of Mexico (2000–6). Raised on a ranch in rural central Mexico's Guanajuato state, he became ...

Mauna Kea Observatories

(Encyclopedia)Mauna Kea Observatories mouˈnə kāˈə [key], astronomical observatory complex located on Mauna Kea peak, the “white mountain” on the island of Hawaii, at an altitude of more than 13,600 ft (4,1...

Keneally, Thomas

(Encyclopedia)Keneally, Thomas kənēˈlē [key], 1935–, Australian novelist, b. Sydney. For a time a student of religion, and later of law, Keneally has ranged over a wide spectrum of subjects in his many novels...

Newton, Sir Isaac

(Encyclopedia)Newton, Sir Isaac, 1642–1727, English mathematician and natural philosopher (physicist), who is considered by many the greatest scientist that ever lived. Newton was his university's representa...

refraction

(Encyclopedia)refraction, in physics, deflection of a wave on passing obliquely from one transparent medium into a second medium in which its speed is different, as the passage of a light ray from air into glass. O...

Frankfurt Parliament

(Encyclopedia)Frankfurt Parliament, 1848–49, national assembly convened at Frankfurt on May 18, 1848, as a result of the liberal revolution that swept the German states early in 1848. The parliament was called by...

candidiasis

(Encyclopedia)candidiasis kănˌdĭdīˈəsĭs [key], infection caused by fungi of the genus Candida; also called moniliasis after a former name of the genus. The most common forms of candidiasis, caused by C. albi...

quasar

(Encyclopedia)quasar kwāˈsär [key], one of a class of blue celestial objects having the appearance of stars when viewed through a telescope and currently believed to be the most distant and most luminous objects...