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Bogotá

(Encyclopedia)Bogotá bōgōtäˈ [key], city (2021 metro area est. pop. 11,167,000), central Colombia, cap...

(Encyclopedia)Vesta vĕsˈtə [key], in astronomy, the fourth asteroid to be discovered. It was found in 1807 by H. Olbers. It is the third largest asteroid in size, with a diameter of c.326 mi (525 km). Its averag...

Galileo

(Encyclopedia)Galileo (Galileo Galilei) gălˌĭlēˈō; gälēlĕˈō gälēlĕˈē [key], 1564–1642, great Italian astronomer, mathematician, and physicist. By his persistent investigation of natural laws he la...

space station

(Encyclopedia)space station or space platform, artificial earth satellite, usually manned, that is placed in a fixed orbit and can serve as a base for astronomical observations; zero-gravity materials processing; s...

My Lai incident

(Encyclopedia)My Lai incident mē lī [key], a massacre of Vietnamese civilians by U.S. soldiers in the Vietnam War. On Mar. 16, 1968, a unit of the U.S. army's Americal division, led by Lt. William L. Calley, inva...

Hoover Dam

(Encyclopedia)Hoover Dam, 726 ft (221 m) high and 1,244 ft (379 m) long, on the Colorado River between Nev. and Ariz.; one of the world's largest dams. Built between 1931 and 1936 by the U.S. Bureau of Reclamation,...

Grand Coulee Dam

(Encyclopedia)Grand Coulee Dam ko͞oˈlē [key], 550 ft (168 m) high and 4,173 ft (1,272 m) long, on the Columbia ...

Glen Canyon Dam

(Encyclopedia)Glen Canyon Dam, 710 ft (216 m) high, 1,560 ft (475 m) long, NE Ariz., on the Colorado River. The key unit of the U.S. Bureau of Reclamation's Colorado River storage project, it is one of the world's ...

Fourier, Charles

(Encyclopedia)Fourier, Charles shärl fo͞oryāˈ [key], 1772–1837, French social philosopher. From a bourgeois family, he condemned existing institutions and evolved a kind of utopian socialism. In Théorie des ...

degree-day

(Encyclopedia)degree-day, a unit of measure used to estimate the fuel and power requirements in heating and cooling a building; it is equal to a difference of 1 degree between the outdoor daily average temperature ...