Labels:text | screenshot | font | number 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.