It is well known that the speed of light, although large, is a finite value. There are quite material objects (e.g. photons – particles that make up light) that move at the speed of light. So how does the world “look” through the eyes of such fast objects?
The Special Theory of Relativity (STR) occupies the most important place in the discussion of this question. According to the conclusions of this theory (which at the moment are well confirmed by experimental facts), when some object moves at the speed of light, any long interval of time for this object becomes equal to zero.
It is important to note that any interval of time, even billions of years, for an object accelerated to the speed of light will turn exactly to zero, not to an infinitesimal interval of time. And what does it mean if the time interval has turned to zero?
It means that no action is possible, including observation, vision, vision and so on. Thus, an object flying at the speed of light will not see anything. And in general this object in fact is not even aware of the fact of its existence, and the existence of the world around it, because it also needs time. Although with respect to the Earth, for example, this object will quite exist, and perhaps for a very decent amount of time to travel at the speed of light.
Photons are such objects, which from the moment of their emission to their absorption fly only at the speed of light, i.e. they do not spend time on acceleration and deceleration, so their whole life for them lasts zero time. Thus, the world through photon’s eyes is as follows: coinciding moments of photon’s birth and death do not allow it to “understand” that the world exists at all.
Note one subtlety: the picky reader may have noted that so far we have skirted the question of what an object moving at the speed of light has to be relative to in order for all this to be true. But this question really does not matter, since according to the basic postulates of STR, if an object has accelerated to the speed of light relative to at least one frame of reference or body, its speed in all frames of reference becomes equal to the speed of light.