Word: nucleus
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Astronomers are excited about the comet not because of what they will observe from the ground but because of the five space probes launched since last year by Europe, Japan and the Soviet Union. The European craft will approach to within 300 miles of the comet's nucleus. A March mission of the space shuttle will be dedicated entirely to Halley's experiments. A battery of cameras, telescopes and mass spectrometers will analyze the comet's 30 million-to-70 million-mile tail and will seek to probe its mysterious, icy heart, which may hold clues to the origin...
...soldiers in his terrorist war. These days, youngsters such as Abdel Aziz Merzoughi and Ben Ahmed Chaoval, who survived the Vienna attack, are generally guided from behind the scenes by trained professional planners who handle strategy and logistics. No matter how many of the young gunmen are killed, the nucleus of Abu Nidal's organization survives to strike again and again from the shadows. The grim challenge posed by terrorism's renegade mastermind is that he will continue to break new and bloody ground, not only in his selection of victims but also in the use of innovative methods...
...separate quirks, abilities and housekeeping chores. Electromagnetism makes it possible for elevators to rise, light bulbs to glow and lightning to snake across the sky. Gravity holds chairs to the floor and planets in their orbital paths. The strong force binds together the protons and neutrons in an atomic nucleus. The weak force causes subatomic particles to shoot out of the nuclei of atoms during the radioactive decay of such unstable elements as uranium...
...Fischbach is proved right, his hypothetical force, which he calls hypercharge, would be the fifth known basic force. (Four forces are known to exist: gravity; electromagnetism; the strong force, which binds the atomic nucleus; and the weak force, which is responsible for certain types of radioactivity.) Hypercharge, Fischbach reports in Physical Review Letters, is an extremely weak repulsive force that acts between objects no more than about 600 feet apart and varies in strength from element to element. It is strongest in iron and weakest in hydrogen. Thus, the physicists contend, if an iron ball and, say, a feather were...
...while Harvard will have to deal with the departure of its seniors, it will be returning a nucleus of experienced players, including McKiernan, Fitz, and senior-to-be middle hitter John Freese...