Columbia Encyclopedia

(Encyclopedia) Halley, Edmond hălˈē, hôˈlē [key], 1656–1742, English astronomer and mathematician. He is particularly noted as the first astronomer to predict the return of a comet and the first to point out...

(Encyclopedia) Paracelsus, Philippus Aureolus fĭlĭpˈəs ôrēōˈləs părəsĕlˈsəs [key], 1493?–1541, Swiss physician and alchemist. His original name Theophrastus Bombastus von Hohenheim. He traveled widel...

(Encyclopedia) United States Naval Observatory, a federal astronomical observatory, located in Washington, D. C. It evolved from the Navy's oldest scientific institution, the Depot of Charts and Instruments, founded...

(Encyclopedia) dwarf planet, a nonluminous body of rock or gas that orbits the sun and has a rounded shape due to its gravity. Unlike a planet, a dwarf planet is not capable of clearing its orbit of smaller objects ...

(Encyclopedia) dysprosium dĭsprōˈzēəm [key] [Gr.,=hard to get at], metallic chemical element; symbol Dy; at. no. 66; at. wt. 162.500; m.p. 1,412℃; b.p. 2,562℃; sp. gr. 8.54 at 25℃; valence+3. Dysprosium i...

(Encyclopedia) Brautigan, Richard brôˈtəgăn [key], 1935–84, American novelist and poet, b. Tacoma, Wash. He was a counterculture hero of the 1960s and 70s, and his work is an indictment of America's cultural e...

(Encyclopedia) Smith, W. Eugene (William Eugene Smith), 1918–78, American photojournalist, b. Wichita, Kan. Smith is considered one of the principal masters of modern photojournalism. The distorted newspaper cover...

(Encyclopedia) Zacatecas säkätāˈkäs [key], state (1990 pop. 1,276,329), 28,125 sq mi (72,844 sq km), N central Mexico. Zacatecas is the capital. Lying on the central plateau, Zacatecas is a state of semiarid pl...

(Encyclopedia) radar astronomy, application of radar to the determination of distances and planetary features within the solar system, such as rotation rates. A short burst of radio waves is transmitted in the direc...

(Encyclopedia) Fugger fo͝ogˈər [key], German family of merchant princes. The foundation of their wealth was laid by Hans Fugger, allegedly a weaver, who moved to Augsburg in 1367. His descendants built up the fam...