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A discoverer of six comets, Whipple may be best known for his comet research. Five decades ago, he first suggested that comets were "icy conglomerates," what the press called "dirty snowballs." His dirty snowball theory caught the imagination of the public even as it revolutionized comet science.
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Answer:
A discoverer of six comets, Whipple may be best known for his comet research. Five decades ago, he first suggested that comets were "icy conglomerates," what the press called "dirty snowballs." His dirty snowball theory caught the imagination of the public even as it revolutionized comet science.