Final answer:
Stars which never rise or set are located in the circumpolar zone of the celestial sphere.
Step-by-step explanation:
Stars which never rise or set are located in the circumpolar zone of the celestial sphere. This zone is near the celestial poles, which are points around which the sphere of the sky turns. Stars within a certain distance from the North Pole are always above the horizon, day and night, and are part of the north circumpolar zone. Similarly, stars within a certain distance from the south celestial pole never rise and are part of the south circumpolar zone.