Final answer:
Stars have lower velocities as they orbit further from the galactic center due to conservation of angular momentum.
Step-by-step explanation:
The reason we would expect lower velocities of stars as they orbit further from the galactic center is due to conservation of angular momentum. Angular momentum is a property of rotating systems, and in the case of stars orbiting a galactic center, it remains the same as long as there are no external torques acting on the system. As the stars move further from the center, they have to cover a larger distance in the same amount of time, which means their velocities must decrease to maintain constant angular momentum.