Why Does Mass Create Gravity? | Brian Greene

Gravity is not a force. It never was. In this video, we break apart one of the most persistent myths in science and reveal the true physical reality hiding beneath the everyday sensation of weight and falling. Mass does not pull objects through empty space using invisible mechanical tethers. Instead, concentrated energy geometrically rewrites the very architecture of spacetime itself, forcing every nearby object to follow a curved path that only feels like straight-line motion. From the energy momentum tensor to the four dimensional geodesics of general relativity, this video takes you deep into the mathematical machinery that governs every falling apple, every orbiting planet, and every galaxy curving through the cosmos. If you have ever looked up at the night sky and wondered why the universe holds together the way it does, this video gives you the real answer, grounded entirely in the geometry of spacetime and the physics of concentrated energy density. #gravity #generalrelativity #spacetime #alberteinstein #physicseducation #spacetimecurvature #whatisagravity #geodesics #energymomentumtensor #massandenergy #curvedspacetime #gravityphysics #scienceexplained #physicsfacts #quantumscience #relativity #cosmology #howgravityworks #spaceandtime #physicsmindblown