No, according to the theory of special relativity, the speed of light in a vacuum is constant and independent of the motion of the source or observer. This principle is known as the constancy of the speed of light. It means that the speed of light, denoted by 'c', is always approximately 299,792,458 meters per second in a vacuum, regardless of the motion of the source emitting the light or the observer measuring it.
Special relativity introduces the concept of time dilation and length contraction, which affect the perception of time and space for objects moving relative to each other. However, the speed of light remains the same for all observers, regardless of their relative motion. This concept has been extensively tested and confirmed by numerous experiments and observations.