Word: diameterically
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Dates: during 1980-1989
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Excimer lasers, which use a different kind of chemical reaction, produce beams of short wavelengths that could destroy a missile by focusing on it for only a second or so. But the generating apparatus is so bulky that it could not be lifted into orbit; the laser stations would have...
Even as new Voyager transmissions were being received at J.P.L., scientists were feverishly interpreting the early results. Computer-enhanced photographs of the moons Titania and Oberon, each about 1,000 miles in diameter, showed that Oberon had a three-mile-high peak and that the surfaces of both moons were...
Now an extraordinary newcomer will join that celestial company. The California Institute of Technology, working with the University of California, will build the world's biggest optical telescope on the volcano's crest; construction could begin as early as 1986. The mammoth instrument, made possible by a $70 million grant...
Yet conventional telescopes cannot be simply scaled up indefinitely. As the mirrors get bigger, they begin to sag under their own weight. Indeed, for years many astronomers believed that a 200-in. diameter was the practical limit for an optical telescope.
The multitude of artifacts already examined are invaluable, not simply for their rarity but for what they will reveal about the seagoing life of the Mediterranean 34 centuries ago. Before the advent of marine archaeology, notes Bass, "we knew more about the safety pins and sewers of Athens than we...