The spectrum of light is a wave-band within the greater spectrum of gravity but because there is no construct for the spectrum of gravity humanity still believes that all is contained within the spectrum of light. This is akin to insisting that all is contained within the spectrum of sound. The Physics of Immortality explains the spectrum of gravity and uses the current standards of science to explain it. This book is the result of a 12 year collaboration by Tom Kitt and Rod McCormick. 

Excerpt
The birth of energy is an escape from freedom but why we would wish to escape our own freedom is a question we cannot answer. Perhaps you believe that energy is all that you are? If this be so, then there is nothing in this book to interest you. I will remind you however that energy is a state of movement and that it would be worthwhile to consider what you may become if the movement should stop - and it does stop – repeatedly!