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black hole

(Encyclopedia)black hole, in astronomy, celestial object of such extremely intense gravity that it attracts everything near it and in some instances prevents everything, including light, from escaping. The term was...

Argonne National Laboratory

(Encyclopedia)Argonne National Laboratory, research center, based in Argonne, Ill., 27 mi (43 km) SW of downtown Chicago, with other facilities at the Idaho National Engineering Laboratory, 50 mi (80 km) W of Idaho...

Grand Junction

(Encyclopedia)Grand Junction, city (2020 pop. 65,560), seat of Mesa co., W Colo., at the junction of the Gunnison and Colorado rivers; inc. 1891. The shipping and pro...

Vavilov, Sergei Ivanovich

(Encyclopedia)Vavilov, Sergei Ivanovich vəvēˈləf [key], 1891–1951, Russian physicist. In 1932 he became director of the P. N. Lebedev Physical Institute, which he organized around the laboratory of the Sovie...

Wrangell Mountains

(Encyclopedia)Wrangell Mountains, S Alaska, extending c.100 mi (160 km) SE from the Copper River to the Canadian border, where they meet the St. Elias Mts. Mt. Blackburn (16,523 ft/5,036 m) is the highest peak. The...

Pearson, Drew

(Encyclopedia)Pearson, Drew, 1897–1969, American journalist and radio commentator, b. Evanston, Ill. He traveled around the world as a correspondent before joining the Baltimore Sun in 1926. Pearson gained nation...

Roscommon, county, Republic of Ireland

(Encyclopedia)Roscommon rŏskŏmˈən [key], county (1991 pop. 51,876), 951 sq mi (2,463 sq km), central Republic of Ireland. The county seat is Roscommon. A part of the central plain of Ireland, the region is low-...

electrodynamics

(Encyclopedia)electrodynamics, study of phenomena associated with charged bodies in motion and varying electric and magnetic fields (see charge; electricity); since a moving charge produces a magnetic field, electr...

Albany Regency

(Encyclopedia)Albany Regency, name given, after 1820, to the leaders of the first political machine, which was developed in New York state by Martin Van Buren. The name derived from the charge that Van Buren's prin...

Steen, Jan

(Encyclopedia)Steen, Jan yän stān [key], 1626–79, Dutch genre painter, b. Leiden. He studied in Utrecht and in Haarlem under Van Ostade and Van Goyen, whose daughter he married. His huge production of paintings...