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gamma-ray astronomy

(Encyclopedia)gamma-ray astronomy, study of astronomical objects by analysis of the most energetic electromagnetic radiation they emit. Gamma rays are shorter in wavelength and hence more energetic than X rays (see...

space probe

(Encyclopedia)space probe, space vehicle carrying sophisticated instrumentation but no crew, designed to explore various aspects of the solar system (see space exploration). Unlike an artificial satellite, which is...

Ohio, state, United States

(Encyclopedia)CE5 Ohio, midwestern state in the Great Lakes region of the United States. It is bordered by Pennsylvania (NE), West Virginia (SE) and Kentucky (S) across the Ohio River, Indiana (W), and Michigan ...

civil service

(Encyclopedia)civil service, entire body of those employed in the civil administration as distinct from the military and excluding elected officials. The term was used in designating the British administration of I...

Herod

(Encyclopedia)Herod, dynasty reigning in Palestine at the time of Jesus. As a dynasty the Herods depended largely on the power of Rome. They are usually blamed for the state of virtual anarchy in Palestine at the b...

Blake, William

(Encyclopedia)Blake, William, 1757–1827, English poet and artist, b. London. Although he exerted a great influence on English romanticism, Blake defies characterization by school, movement, or even period. At the...

steamship

(Encyclopedia)steamship, watercraft propelled by a steam engine or a steam turbine. Despite such innovations as turbo-electric drive, which converts steam energy into rotational power for turning the propeller...

Richmond, cities, United States

(Encyclopedia)Richmond. 1 City (1990 pop. 87,425), Contra Costa co., W Calif., on San Pablo Bay, an inlet of San Francisco Bay; inc. 1905. It is a deepwater commercial port and an industrial center with oil refiner...

feudalism

(Encyclopedia)feudalism fyo͞oˈdəlĭzəm [key], form of political and social organization typical of Western Europe from the dissolution of Charlemagne's empire to the rise of the absolute monarchies. The term fe...

Columbia University

(Encyclopedia)Columbia University, mainly in New York City; founded 1754 as King's College by grant of King George II; first college in New York City, fifth oldest in the United States; one of the eight Ivy League ...