This is a book on theoretical physics. Theoretical, meaning exploring a theory, exploring an explanation thought up by someone that explains something. It's a best guess based on observed data and personal interpretations of what that data means and the results of experiments to help conform that explanation. Physics, meaning physical science. Simple. The study of all physical things and phenomenon. From the biggest, to the smallest, and even all your day-to-day stuff. So theoretical physics is just discussing theories and explanations to how all of nature physically works. What causes what, why something happens, and such like that. In science, everything is considered a theory. Everything. Nothing is written in stone. And no matter how solid of a theory something is, it is still a theory. What is gravity? Have you ever really considered it? How it effects you? Some of the greatest minds ever to have lived spent years of their lives trying to understand and explain gravity. Yet their picture remains incomplete, until now. Before proceeding into the solutions, you must view the very generalized outline of the existing problems we are currently encountering with our comprehension of the universe as a whole. Because despite all the knowledge we have discovered and compiled in physical science, the vast majority of the phenomenon we observe in the universe remains a mystery to us. Erik Warsaw understands the simplest answers often hold the truth. Gravity is not some exotic force exerted from other dimensions or some mystery to remain unsolved. Even those unfamiliar with science will understand the simple truth found in the pages of Dark Matter. From the Big Bang to the present, rediscover your universe!