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Portable Network Graphic  |  1996-04-23  |  7KB  |  242x277  |  8-bit (43 colors)
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OCR: SHORT-PERIOD COMET SHORT-PERIOD COMETS have orbital periods between a few years and 200 years long. They may originate in either the Kuiper Belt or the Öpik-Oort Cloud. Long-period comets have orbital periods in excess of 200 years, and some have periods of millions of years. Long-period comets originate in the Öpik-Oort Cloud.