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Comets A comet is a small body of __________, rock and ____________ that follows a highly _______________ orbit around the sun. Hydrogen Envelope Comets come from two regions of the solar system, the _______________________ or the ____________________. Short-Period Comets Short-period comets from the ___________________ come from _________________ between objects. Short-period comets take less than _________ years to orbit the sun. Short-period comets have a _____________ life span as they lose layers each time they pass the ____________. Long-Period Comets Originate in the ______________________________, a spherical region that surrounds the solar system and extends almost half way to the nearest star. Long-period comets form when _____________________________________ or when an objects in the Oort cloud is disturbed by the gravity of a nearby ___________. Long-period comets can take up to __________________________________ to orbit the sun.