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Plot of the structure in comet Hyakutake. The nucleus is the bright peak, and the dust coma (green area at top) is visible toward the sun. Trailing the nucleus is an arc of cyanogen (CN) emission (green arc) and two dust condensations (below the green arc). Simulations imply that the CN arc resulted from interaction between the gas coma and a secondary source, possibly the inner dust condensation. Field of view, 8100 kilometers. See page 676. [WIYN Observatory image, by Walter Harris, University of Wisconsin, Madison]

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Science. ISSN 0036-8075 (print), 1095-9203 (online)