Word: thrustings
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Like dancers in an intricately choreographed ballet, each craft will perform a variety of tasks, complementing and aiding one another every thrust of the way. Japan's two probes, Sakigake (Pioneer) and Suisei (Comet), between them will study the solar wind and examine the hydrogen cloud surrounding the comet. The Soviet Union's Vega 1 and Vega 2 will analyze the abundant dust motes and charged gases that envelop the comet's nucleus. Most remarkable of all, data and pictures from the Vega twins will enable European scientists to chart Halley's course precisely enough to allow their probe, Giotto...
Like the heated gases bursting from a jet engine, the departing cometary ! molecules exert a force on the icy nucleus, giving the comet its independent thrust. But because the ice does not vaporize uniformly and the nucleus rotates, the jet action propels the comet in many directions and can either accelerate or decelerate it. Apparently this accounts for the nongravitational motions that astronomers had previously observed. After 35 years of scrutiny, Whipple's model of comet properties is still accepted today. "When I first realized about the jet action of comets," says the 79-year-old astronomer, "Boy! That...
Brustein's Changeling is thus about passion and virginity--though not of the Hail Mary, controversially-Catholic variety that recently has been thrust into the headlines. Here the reputation of virginity--protagonist Beatrice-Joanna Vermandero's (Diane D'Aquila) obsession to keep her honor intact--leads to doom and destruction. Female chastity is the ideal that justifies the most heinous atrocities...
...recent performance, 15 children thrust their fists into the air, thrust out their legs, and then--under the direction of their student teacher--moved forward, approaching the audience and changing fists into open hands offered to shake. In their four-minute routine, the children and student directors expressed aggression, fear and friendship through dance. It was all part of what Citystep strives to teach--the expression through dance of the experiences of children growing up in a city. Citystep participants and the 100 children with whom they work end each year with a springtime performance in Sanders Theater featuring original...
Another controversial issue addressed by the latest U.S. plan is throw weight, a measure of the power of missiles to thrust warheads and guidance gear during an attack. The Soviets now have about 5.7 million kg of ballistic- missile throw weight, compared with the U.S.'s 2 million. The U.S. plan calls for substantial direct cuts in maximum throw weight in order to reduce the opportunity for "breakout," the ability of one side suddenly to increase its offensive capabilities...