Speed of Light is constant in a vacuum. You can either take it as a given like many other given things in nature. You can also take that it is so because photons do not have mass! Hence they are not subject to the usual laws of motion as discovered by Newton. Finally you can take it that Time and Space are relative. They change and bend in relation to the observer and the state of consciousness. Light is the supporting power or the stable basis around which they bend. In a way it is Light that, like Consciousness, is a fundamental reality. Space, Time, Matter and all else has emerged subsequently.
Affectionately,
Alok Da
