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Diana, in Roman religion

(Encyclopedia)Diana dīănˈə [key], in Roman religion, goddess of the moon, forests, animals, and women in childbirth. She was probably originally a forest goddess and a special patroness of women. She was identi...

rocket, in aeronautics

(Encyclopedia)CE5 Relative positions of the components of the Saturn V rocket, the U.S. space vehicle used in the moon missions rocket, any vehicle propelled by ejection of the gases produced by combustion of s...

Ptolemaic system

(Encyclopedia)Ptolemaic system tŏlˌəmāˈĭk [key], historically the most influential of the geocentric cosmological theories, i.e., theories that placed the earth motionless at the center of the universe with a...

capital, in economics

(Encyclopedia)capital, in economics, the elements of production from which an income is derived, usually defined with the exception of land and labor. As originally used in business, capital denoted interest-bearin...

Shklovsky, Iosif Samuilovich

(Encyclopedia)Shklovsky, Iosif Samuilovich yôsˈĭf səmo͞oēlˈəvĭch shklŏfˈskē [key], 1916–85, Soviet astronomer. He was head of the department of radio-astronomy at the Sternberg Astronomical Institute,...

observatory, orbiting

(Encyclopedia)observatory, orbiting, research satellite designed to study solar radiation, electromagnetic radiation from distant stars, the earth's atmosphere, or the like. Because the atmosphere and other aspects...

man, in anthropology and biology

(Encyclopedia)man: see anthropology; human evolution; race. ...

glacial periods

(Encyclopedia)glacial periods, times during which large portions of the earth's surface were covered with thick glacial ice sheets. In the Pleistocene epoch, in the Carboniferous and Permian periods of the Paleozoi...

Mars, in Roman religion and mythology

(Encyclopedia)Mars, in Roman religion and mythology, god of war. In early Roman times he was a god of agriculture, but in later religion (when he was identified with the Greek Ares) he was primarily associated with...

biometrics, in security and personal identification

(Encyclopedia)biometrics, in security and personal identification, the electronic verification of individuals using biological traits, such as iris or retinal scanning, fingerprints, or face recognition, and the te...