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Smoot, George Fitzgerald, 3d

(Encyclopedia)Smoot, George Fitzgerald, 3d smo͞ot [key], 1945–, American astrophysicist, b. Jacksonville, Fl., Ph.D. Massachusetts Institute of Technology 1970. Smoot has been a professor at the Univ. of Califor...

horse latitudes

(Encyclopedia)horse latitudes, two belts of latitude where winds are light and the weather is hot and dry. They are located mostly over the oceans, at about 30° lat. in each hemisphere, and have a north-south rang...

Martin Van Buren National Historic Site

(Encyclopedia)Martin Van Buren National Historic Site: see National Parks and Monuments (table)national parks and monuments (table). ...

Christus, Petrus

(Encyclopedia)Christus or Cristus, Petrus both: pēˈtrəs krĭsˈtəs [key], fl. 1444–c.1473, Flemish painter; a follower and probably a pupil of the Van Eycks. In 1444 he became a free citizen of Bruges, where ...

Caesar, Sid

(Encyclopedia)Caesar, Sid (Isaac Sidney Caesar), 1922–2014, American comedian, one of the stars of the “golden age of live television,” b. Yonkers, N.Y. While performing in a World War II military show he met...

infrared astronomy

(Encyclopedia)infrared astronomy, study of celestial objects by means of the infrared radiation they emit, in the wavelength range from about 1 micrometer to about 1 millimeter. All objects, from trees and building...

pyranometer

(Encyclopedia)pyranometer pĭrˌənŏmˈətər [key], actinometer used to measure the total radiation incident on a surface. ...

Orbiting Astronomical Observatory

(Encyclopedia)Orbiting Astronomical Observatory (OAO), series of four orbiting observatories (see observatory, orbiting) launched between 1966 and 1972 by the National Aeronautics and Space Administration (NASA) to...

radioactive isotope

(Encyclopedia)radioactive isotope or radioisotope, natural or artificially created isotope of a chemical element having an unstable nucleus that decays, emitting alpha, beta, or gamma rays until stability is reache...

X ray

(Encyclopedia)CE5 Typical X-ray composite spectrum (intensity as a function of frequency) X ray, invisible, highly penetrating electromagnetic radiation of much shorter wavelength (higher frequency) than visibl...