Gravitational physics is the study of how gravity works and its effects on objects in the universe. It explains how massive bodies, like planets and stars, attract each other through a force called gravity. This force is responsible for keeping planets in orbit around the Sun and causing objects to fall to the ground on Earth. One of the key theories in gravitational physics is Newton's Law of Universal Gravitation, which describes how the strength of gravity depends on the masses of the objects and the distance between them. Another important concept is Einstein's General Theory of Relativity, which provides a deeper understanding of gravity as the curvature of space and time caused by mass.