Relativistic physics is a branch of physics that deals with the physical phenomena at very high speeds, typically close to the speed of light. It encompasses Einstein's theory of special relativity and general relativity, which describe the behavior of objects moving at speeds approaching the speed of light and the effects of gravity on spacetime, respectively. Relativistic physics has profound implications for our understanding of the universe, including how time, space, and energy are interconnected. It plays a crucial role in fields such as cosmology, particle physics, and astrophysics.