According to the theory of relativity, as an object approaches the speed of light, time dilation occurs, which means that time appears to pass differently for observers in relative motion. Specifically, time slows down for objects in motion relative to an observer at rest.
Let's consider two observers: Observer A and Observer B. Observer A is at rest relative to an object, and Observer B is moving toward that object at a high speed, approaching the speed of light.
From Observer A's perspective (the stationary observer), Observer B's clock will appear to tick slower as B approaches the speed of light. This is due to the phenomenon of time dilation. As an object accelerates and moves faster, time slows down for that object relative to the stationary observer.
From Observer B's perspective (the moving observer), Observer A's clock will appear to tick faster. This may seem counterintuitive, but it's a consequence of the relative motion between the two observers. Time dilation works both ways, and each observer will observe the other's clock as ticking slower.
It's important to note that these observations are relative to each observer's frame of reference. Each observer will perceive their own clock as ticking normally. It is the comparison between the two observers' clocks that reveals the time dilation effect.
This phenomenon is a fundamental aspect of Einstein's theory of relativity and has been experimentally verified. It shows that time is not an absolute concept but depends on the relative motion between observers.