Word: impaction
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There ought to be plenty of fireworks this Fourth of July. But the best pyrotechnics show is likely to take place 268 million miles away, when a probe fired from the Deep Impact spacecraft is scheduled to collide with Comet Tempel 1, a nine-mile-long rock roaring through space at 66,880 m.p.h. The planned cosmic crack-up will gouge out a football-field-size crater and may be visible from the U.S. Pacific Coast and points west. It may also reveal a lot about the chemistry of comets, fossils of the early solar system...
...Deep Impact is really a craft and a half: an SUV-size mother ship and a smaller impactor--basically a guided missile equipped with a targeting system and a camera. Early on July 3, when the paired machines are 24 hours from the comet, the mother ship is set to release the impactor to free-fly the last 500,000 miles. If all goes well, the probe and comet should collide at 1:52 a.m. E.T. on July 4, producing the same explosive bang as 4.5 tons of TNT. The mother ship, trailing a safe 310 miles behind, will photograph...
...that he had quit just before the summit in Reykjavík, "when he knew full well we hadn't misled anyone on purpose. His timing could have been worse, but not much." Said Kalb, making light of such concern: "I suspect that I will dissolve very quickly under the impact of the meeting in Reykjav?...
...meantime, a special South African parliamentary committee is studying the impact of sanctions and exploring ways of circumventing them. Businessmen are attending strategy sessions on how to continue exporting iron, steel and other goods despite the U.S. boycott. Under discussion are techniques ranging from the creation of foreign "front" companies to the rerouting of trade through such neighboring black states as Lesotho and Swaziland...
...have decided not to have children, and are likely to be ambivalent about taking the test once it is no longer experimental. Recognizing how devastating a positive test result could be, Johns Hopkins, Columbia University and Massachusetts General Hospital are conducting a three-year study to determine the emotional impact of early diagnosis. "We're trying to find out what type of psychological care these people will need," says Jason Brandt, a Johns Hopkins neuropsychologist. "Will their families break up? Will they be unable to concentrate on their jobs...