Why Physics Completely Breaks Down at the Planck Scale

#Physics #Cosmos #QuantumGravity This video is a calm, complete walk down to the Planck scale, the smallest meaningful length in the universe, where our deepest theories stop working. Starting from the simple act of cutting something in half, it builds the Planck length from three fundamental constants, the speed of light, Newton's gravitational constant, and Planck's constant, then explores why physics breaks down there: how any attempt to probe it forms a black hole, how general relativity and quantum mechanics contradict each other at that scale, and how ideas like quantum foam, black hole entropy, the holographic principle, string theory, and loop quantum gravity try to describe the bottom of reality. It closes by asking, and answering, whether the world has a smallest size at all. Sources: a. Public physics references on the Planck units, the Planck length, time, mass, energy, and temperature, and their derivation from fundamental constants. b. Histories and explanations of general relativity, quantum mechanics, the uncertainty principle, the Schwarzschild radius, black hole thermodynamics, and Hawking radiation. c. Overviews of quantum gravity research, including quantum foam, the holographic principle, string theory, loop quantum gravity, and experimental searches using gamma-ray bursts and cosmic rays. #Physics #Cosmos #QuantumGravity #PlanckScale #PlanckLength #QuantumGravity #BlackHoles #StringTheory #LoopQuantumGravity #Spacetime