Word: nucleus
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Dates: during 1980-1989
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...close encounters were set for March because that is when the comet passes through earth's orbital plane, the same level in which the spacecraft travel. Over several whirligig days, the flotilla will scrutinize the comet in exhaustive detail, from the fuzzy gaseous cloud that surrounds its icy nucleus to the two tails that by then will be streaming for millions of miles behind...
...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, to come within about 300 miles of the nucleus, snapping thousands of photographs as it swoops by. Says Kunio Hirao, a former top official...
...orbit of a periodic comet that bears his name (it reappears every 3.3 years), insisted that the orbit of "his" comet could not be explained solely by gravity. He proposed that "ether," an invisible theoretical substance that at the time was believed to pervade space, exerted drag on the nucleus, slowing it down. After observing flares streaming from Comet Halley's surface in 1836, another German astronomer, Friedrich Wilhelm Bessel, conceived a more plausible concept, the fountain theory. Bessel proposed that a comet was a loose clump of particles. He suggested the flares were fountains of these motes erupting from...
...this week, Holy Cross will be trying to handle a Harvard rushing nucleus that has begun to pick up momentum...
...want to see the Comet's nucleus. I've been talking about it for 35 years, and I don't know what it looks like," said Fred L. Whipple, Phillips Professor of Astronomy, Emeritus, of the comet which returns to earthly view every 76 years...