Final answer:
b. Stars in our galaxy have different patterns of motion relative to the center. Population I stars revolve around the galactic center while Population II stars show random motions.
Step-by-step explanation:
b. Relative to the center of our galaxy, stars do not remain stationary. Population I stars, which are found in the disk of our galaxy, follow nearly circular orbits around the galactic center. These stars include bright supergiant stars, main-sequence stars of high luminosity, and members of young open star clusters.
On the other hand, Population II stars are found throughout the galaxy and do not follow a specific pattern of motion. They can be in the disk or follow eccentric elliptical orbits that carry them high above the galactic disk into the halo.