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astronaut

(Encyclopedia)astronaut, crew member on a U.S. manned spaceflight mission; the Soviet term is cosmonaut. Candidates for manned spaceflight are carefully screened to meet the highest physical and mental standards, a...

Lowell Observatory

(Encyclopedia)Lowell Observatory, astronomical observatory located in Flagstaff, Ariz.; it was founded in 1894 by Percival Lowell, the American astronomer who popularized the idea that Mars might support intelligen...

Stevens

(Encyclopedia)Stevens, family of U.S. inventors. John Stevens, 1749–1838, b. New York City, was graduated from King's College (now Columbia Univ.) in 1768. He studied law (1768–71) and soon joined his father, a...

Welles, Gideon

(Encyclopedia)Welles, Gideon wĕlz [key], 1802–78, American statesman, b. Glastonbury, Conn. He was (1826–36) editor and part owner of the Hartford Times, one of the first New England papers to support Andrew J...

York, city, England

(Encyclopedia)York, city and unitary authority (2011 pop. 198,051), N England, at the confluence of the Ouse and Foss rivers. It is located at the historical junction of the three ridings of Yorkshire. York, a rail...

Stevenson, Robert Louis

(Encyclopedia)Stevenson, Robert Louis, 1850–94, Scottish novelist, poet, and essayist, b. Edinburgh. Handicapped from youth by delicate health, he struggled all his life against tuberculosis. He studied law and w...

Seaborg, Glenn Theodore

(Encyclopedia)Seaborg, Glenn Theodore sēˈbôrg [key], 1912–99, American chemist, b. Ishpeming, Mich., grad. Univ. of California at Los Angeles, 1934, Ph.D. Univ. of California at Berkeley, 1937. In 1939, he beg...

Rolling Stones

(Encyclopedia)Rolling Stones, English rock music group that rose to prominence in the mid-1960s and continues to exert great influence. Member...

London Company

(Encyclopedia)London Company, corporation composed of stockholders residing in and about London, which, together with the Plymouth Company (see Virginia Company), was granted (1606) a charter by King James I to fou...

plutonium

(Encyclopedia)plutonium plo͞otōˈnēəm [key], radioactive chemical element; symbol Pu; at. no. 94; mass no. of most stable isotope 244; m.p. 641℃; b.p. 3,232℃; sp. gr. 19.84 at 20℃; valence +3, +4, +5, or ...