According to our current understanding of physics, an object with mass cannot travel at the speed of light. As an object with mass accelerates towards the speed of light, its energy requirements would become infinite, making it impossible to reach or exceed the speed of light.
However, let's consider a hypothetical scenario where an object could travel at the speed of light. In this case, there are a few important things to note:
Time dilation: As an object approaches the speed of light, time dilation occurs. From the perspective of the object traveling at the speed of light, time would appear to stand still, and the passage of time for objects at rest would seem to be infinitely slowed down. This means that the object traveling at the speed of light would not experience the same flow of time as an observer at rest.
Relativistic effects: Relativistic effects such as length contraction would also come into play. Objects in motion relative to the observer traveling at the speed of light would appear contracted along their direction of motion. This would result in significant distortions of the observed world.
Given these considerations, if an object were traveling at the speed of light, the interactions it would have with visible objects would be highly distorted. Time for the object would be frozen, and the relativistic effects would cause significant distortions in the appearance of the objects it encounters.
However, it's important to reiterate that, based on our current understanding of physics, objects with mass cannot reach or exceed the speed of light. The concept of an object with mass traveling at the speed of light lies outside the realm of known physics.