Astronomers, sedentary folk, once got much of their exercise running down solar eclipses. That was the only time they had a good look at the lively goings-on in the sun's atmosphere. But those eclipses, that dragged astronomers to Godforsaken parts of the earth, happened less than once a year, lasted only a few minutes and were often masked by clouds.
Not any more. Last week in Technology Review, Sungazer Walter 0. Roberts of Harvard told how up-to-date astronomers dim the sun enough to get a good look at its atmosphere any time they please....
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