According to the theory of special relativity, as an object with mass approaches the speed of light, its relative time dilation increases. This means that time appears to slow down for the moving object compared to a stationary observer.
However, it is important to note that it is impossible for an object with mass to reach or exceed the speed of light. The theory of special relativity states that the speed of light in a vacuum, denoted as 'c,' is the maximum speed that any object or information can travel in the universe.
As an object with mass accelerates towards the speed of light, its energy requirements increase exponentially, approaching infinity as it approaches the speed of light. Therefore, it is not feasible for an object with mass to achieve light speed.
For objects with massless particles, such as photons, which travel at the speed of light, time does not pass from their perspective. This means that from the perspective of a photon, no time elapses during its journey.
However, it's important to note that as a human observer, you cannot experience or measure the effects of traveling at the speed of light. The concept of time dilation and the experiences of objects traveling at relativistic speeds are theoretical and do not correspond to our everyday experiences.