Why does light or anything have a finite speed? In E=mc2, it gives the constant of the speed of light but I don't understand why light has a maximum speed. Is there something that slows down light?
I thought that light travels different speeds depending on what medium that it is in.
Is it possible light goes a set speed because a vacuum is just another medium with things that slow light down?
or is it just a random speed that light or whatever energy moves at?