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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 ...

battery, electric

(Encyclopedia)CE5 Lead storage cell: At the lead-dioxide electrode, electrons from the circuit combine with lead dioxide and sulfuric acid to form lead sulfate and water. At the spongy-lead electrode, lead react...

martial arts

(Encyclopedia)martial arts, various forms of self-defense, usually weaponless, based on techniques developed in ancient China, India, and Tibet. In modern times they have come into wide use for self-protection, as ...

Archaebacteria

(Encyclopedia)Archaebacteria ärˌkēbăktĭrˈēə [key], diverse group of bacteria (prokaryotes), sometimes called the archaea and considered a major group unto themselves. Archaebacteria are contrasted with the ...

Geary, John White

(Encyclopedia)Geary, John White gērˈē [key], 1819–73, American politician and Union general in the Civil War, b. Mt. Pleasant, Pa. In San Francisco from 1849 to 1852, Geary was the first U.S. postmaster, the l...

Fuller, R. Buckminster

(Encyclopedia)Fuller, R. Buckminster (Richard Buckminster Fuller), 1895–1983, American architect and engineer, b. Milton, Mass. Fuller devoted his life to the invention of revolutionary technological designs aime...

Eigen, Manfred

(Encyclopedia)Eigen, Manfred, 1927–2019, German biophysicist, Ph.D. Univ. of Göttingen, 1951. Eigen was on the faculty at the Univ. of Göttingen from 1951 to 1953. He joined the Max Planck Institute for Physica...

Dingell, John David, Jr.

(Encyclopedia)Dingell, John David, Jr., 1928–2019, American congressman, b. Colorado Springs, Colo.; grad. Georgetown Univ. (B.S., 1949; J.D., 1952). He served in the Army (1944–46) and after a brief career in ...

Eddington, Sir Arthur Stanley

(Encyclopedia)Eddington, Sir Arthur Stanley, 1882–1944, British astronomer and physicist. He was chief assistant (1906–13) at the Royal Observatory, Greenwich, and was from 1913 Plumian professor of astronomy a...

D'Avenant, Sir William

(Encyclopedia)D'Avenant or Davenant, Sir William dăvˈənənt [key], 1606–68, English poet, playwright, and theatrical producer. His life and work bridge the gap between the Elizabethan and Restoration ages. His...