Answer:
Light travels at constant speed through a vacuum, even if the light source is moving.
Explanation:
Light have both wave and particle nature. Light uses its wave nature to pass through the mediums by vibrating. Light behaves as particle when it passes through the vacuum. So, light can pass through the vacuum because it does not need any medium to travel. The speed of light in vacuum is same for all the observers regardless of their relative motion with respect to source.
