Gravity Is Geometry

Gravity may feel like the universe’s simplest rule: let go of something, and it falls. But that everyday experience conceals a far stranger truth. Guided by the physics explored by Brian Cox, this episode reveals why falling can make gravity seem to disappear, how Einstein transformed it from an invisible pulling force into the geometry of spacetime, and why this weakest of nature’s fundamental forces became the architect of the cosmos. Travel from weightless aircraft and a tidally locked Moon to colliding galaxies, crushing exoplanets, neutron stars, and the supermassive black hole at the heart of the Milky Way. Along the way, discover how gravity sculpts worlds, squeezes the empty space from atoms, traps light in a cascading river of spacetime, and finally drives physics to the singularity—where general relativity breaks down and the deepest questions about space, time, and reality remain unanswered.