My book seems to not go into a lot of details as to how EM-waves are created. More or less they just state that they are created by accelerated charges. I guess that somehow makes sense since an accelerated charge is clearly altering the electric field everywhere in space and that is as far as I can see what creates an electromagnetic disturbance -> electromagnetic wave. But shouldn't a charge moving with constant velocity do the same? And what is an electromagnetic physically? Is it information about the altering of the field spreading out or..