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sound barrier
(Encyclopedia)sound barrier: see aerodynamics. ...Seward Peninsula
(Encyclopedia)Seward Peninsula, W Alaska, projecting c.200 mi (320 km) into the Bering Sea between Norton Sound and Kotzebue Sound, just below the Arctic Circle. The region is mostly bleak tundra, with long, cold w...Steinbeck, John
(Encyclopedia)Steinbeck, John, 1902–68, American writer, b. Salinas, Calif., studied at Stanford. He is probably best remembered for his strong sociological novel The Grapes of Wrath, considered one of the great ...momentum
(Encyclopedia)momentum mōmĕnˈtəm [key], in mechanics, the quantity of motion of a body, specifically the product of the mass of the body and its velocity. Momentum is a vector quantity; i.e., it has both a magn...Copernican system
(Encyclopedia)Copernican system, first modern European theory of planetary motion that was heliocentric, i.e., that placed the sun motionless at the center of the solar system with all the planets, including the ea...shock wave
(Encyclopedia)shock wave, wave formed of a zone of extremely high pressure within a fluid, especially the atmosphere, that propagates through the fluid at a speed in excess of the speed of sound. A shock wave is ca...Rodchenko, Aleksandr
(Encyclopedia)Rodchenko, Aleksandr. 1891–1956, Russian painter, sculptor, photographer, and designer, b. St. Petersburg. One of the most important and versatile avant-garde artists to emerge after the Russian Rev...Elgin, city, United States
(Encyclopedia)Elgin ĕlˈjĭn [key]. <1> City (2020 pop. 114,797), Cook and Kane counties, NE Ill., o...Fyne, Loch
(Encyclopedia)Fyne, Loch lŏkh fīn [key], arm of the Firth of Clyde, Argyll and Bute, W Scotland. It extends 40 mi (64 km) N and NE from the Sound of Bute. The loch has long been famous for its herring fisheries. ...Barnard's star
(Encyclopedia)Barnard's star, star with the largest observed proper motion (rate of motion across the sky with respect to other stars); located in the constellation Ophiuchus. The star's large proper motion, 10.28...Browse by Subject
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