Es
conocido el hecho de que los objetos del firmamento que nosotros
oteamos desde nuestro observatorio terrestre, no están donde los vemos.
Ya que todos ellos están en movimiento y la imagen que vemos en un
cierto punto nos indica sólo que hace tiempo que el objeto real estuvo
en ese punto. Desde entonces la información sobre la existencia de esa
imagen ha venido hacia nosotros a la velocidad de la luz, mientras que
el objeto real ha seguido su camino a su velocidad real propia...

The following point is fundamental: the time it takes for information to travel from one point to another at velocity c modifies the reality of that information.

For instance, it is known that the velocity at which an object was travelling when it passed through a certain point in the universe is different from the velocity that we now measure in its observable image at that same point. (Munarriz effect) Verifying this could not be simpler. Assuming that an object is approaching our observatory, the real object is closer than the observable image that we receive of it. As the real object and image will reach us together, this means that the observable image has come at a higher velocity. The opposite is true when the object moves away from us; the velocity of the real object is greater than the velocity we observe of its image because the real object is always farther away, which indicates that its velocity is greater.....