According to Albert Einstein's theory of relativity, time dilation occurs as an object's speed approaches the speed of light. As an object approaches the speed of light, time appears to slow down from the perspective of an observer who is at rest relative to the moving object. However, it's important to note that this time dilation effect applies to the perception of time by external observers and not to the object itself.
From the perspective of the object moving at the speed of light, there is no perception of time stopping or decaying processes stopping. The object would experience time passing normally within its own reference frame. However, it's worth mentioning that objects with mass cannot reach or exceed the speed of light according to our current understanding of physics.
When discussing objects moving at relativistic speeds, it's crucial to distinguish between the perspective of an observer at rest relative to the object and the object's own experience of time. Time dilation effects are a consequence of the relative motion between observers and do not imply that processes within the object itself stop or decay.