The video explains how Einstein's theory of general relativity redefined our understanding of gravity, showing that it is not a force but a curvature in space-time caused by mass. This concept was experimentally confirmed by Arthur Eddington during a solar eclipse, demonstrating that light bends around massive objects due to the curvature of space-time.

The chapter explores the evolution of the understanding of gravity, starting with Newton's law of universal gravitation, which describes gravity as a force of attraction between masses. It then transitions to Einstein's revolutionary concept of gravity as a curvature in space-time, explaining how this new perspective accounts for gravitational effects without invoking a traditional force, using thought experiments and analogies to illustrate the concept.

The chapter explores the concept of light bending due to space-time curvature, as proposed by Einstein's theory of general relativity. It describes how Arthur Eddington's 1919 experiment during a solar eclipse provided evidence for this theory by showing that starlight was bent by the sun's gravity, confirming the curvature of space-time.