When eyes see any object, the actual process is far more complicated than one would expect. Light waves within the visible spectrum move from a source toward the object. Some of them then reflect into our eyes. The lenses in our eyes cause the image registered on our retinas to be upside-down, but the brain then reverses it once more to obtain the image of the object in our mind. In order for us to see anything, light must move from the source to an object and then to our eyes.
For example, when a supernova blows up, it takes several years for the light to reach our eyes. By the time we see the star, it may not actually exist at that point in time. Therefore, what is seen is not what is.
The other possible explanation for this is that time does not actually exist at all, and the light from the explosion means that there is a star, just not at this point in time, which does not exist. After a while, the rest of the light passes Earth and the star is gone from our sight, so it is truly gone to us. However, the light continues forever past the Earth, steadily becoming weaker until it fades away.
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