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meteorite

(Encyclopedia)meteorite, meteor that survives the intense heat of atmospheric friction and reaches the earth's surface. Because of the destructive effects of this friction, only the very largest meteors become mete...

von Braun, Wernher

(Encyclopedia)von Braun, Wernher vôn broun [key], 1912–77, German-American rocket scientist and astronautics engineer, b. Germany, grad. Berlin Technological Institute (B.S., 1932), Univ. of Berlin (Ph.D., 1934)...

Tavener, Sir John Kenneth

(Encyclopedia)Tavener, Sir John Kenneth tăvˈənər, –nə [key], 1944–2013, English composer, b. London; studied Royal Academy of Music. Tavener, whose work shows a consistent but evolving tonal or modal style...

duck

(Encyclopedia)duck, common name for wild and domestic waterfowl of the family Anatidae, which also includes geese and swans. It is hunted and bred for its meat, eggs, and feathers. Strictly speaking, duck refers to...

Laval, Pierre

(Encyclopedia)Laval, Pierre lävälˈ [key], 1883–1945, French politician. Elected (1914) to the chamber of deputies as a Socialist, he held various cabinet posts and in 1926 became a senator as an Independent, ...

megalithic monument

(Encyclopedia)megalithic monument mĕgəlĭthˈĭk [key] [Gr.,=large stone], in archaeology, a construction involving one or several roughly hewn stone slabs of great size; it is usually of prehistoric antiquity. T...

aerial and satellite photography

(Encyclopedia)aerial and satellite photography, technology and science of taking still or moving-picture photographs from a camera mounted on a balloon, airplane, satellite, rocket, or spacecraft. In the 19th cent....

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 ...

crater

(Encyclopedia)crater, circular, bowl-shaped depression on the earth's surface. (For a discussion of lunar craters, see moon.) Simple craters are bowl-shaped with a raised outer rim. Complex craters have a raised ce...

city

(Encyclopedia)city, densely populated urban center, larger than a village or a town, whose inhabitants are engaged primarily in commerce and industry. In the United States a city is legally an incorporated municipa...