Why We Haven't Yet Solved Gravity... And What Happens When We Do

Hey guys! We’re now live on Spotify🎧 Listen here: https://open.spotify.com/show/5rqQFYd... A fridge magnet lifts a paperclip, and the entire planet loses a contest it should not lose. That weakness is why physics has run for ninety-six years on two theories that are each flawless and cannot both be true. What happens where the contradiction is forced open? A slow walk through the deepest unsolved problem in physics — why gravity refuses to be quantised, what a finished theory would say about the inside of a black hole and the first instant, and what it would still refuse to give us. Get comfortable and let this long, quiet walk through the unfinished edge of physics keep you company tonight. Subscribe to Sundown Science if you enjoy taking the long way around the universe. CHAPTERS 0:00 Introduction 1:22 Two rulebooks, neither one wrong 9:37 How the seam stayed hidden 18:46 Where the theories collide 27:40 The calculation that ended it 37:40 The force that is also the room 47:22 The equation with no time in it 57:13 Four problems, not one 1:05:08 What is inside a black hole 1:15:57 Whether the past survives 1:25:54 The first instant 1:35:06 What space is made of 1:46:35 What it would not give us 1:57:56 What happens when we solve it SOURCES New Test of the Gravitational 1/r2 Law at Separations down to 52 um (Lee et al., Phys. Rev. Lett. 124, 101101) — https://link.aps.org/doi/10.1103/Phys... New Test of the Gravitational 1/r2 Law at Separations down to 52 um (arXiv preprint) — https://arxiv.org/abs/2002.11761 New Test of the Gravitational 1/r2 Law (PubMed record) — https://pubmed.ncbi.nlm.nih.gov/32216... Short-Range Tests of Newton's Inverse-Square Law (Eöt-Wash Group, University of Washington) — https://www.npl.washington.edu/eotwas... Even at short range, Newton's law still rules (Nature Reviews Physics) — https://www.nature.com/articles/s4225... Spin Entanglement Witness for Quantum Gravity (Bose et al., Phys. Rev. Lett. 119, 240401) — https://link.aps.org/doi/10.1103/Phys... Observable quantum entanglement due to gravity (npj Quantum Information) — https://www.nature.com/articles/s4153... The Black Hole Information Paradox: A Resolution on the Horizon (Engelhardt, MIT Physics Annual 2023) — https://physics.mit.edu/wp-content/up... The Large N Limit of Superconformal Field Theories and Supergravity (Maldacena) — https://arxiv.org/abs/hep-th/9711200 Notes for a brief history of quantum gravity (Rovelli) — https://arxiv.org/abs/gr-qc/0006061 Two Loop Quantum Gravity — The Ultraviolet Behavior of Einstein Gravity (Goroff & Sagnotti, INSPIRE record) — https://inspirehep.net/literature/319298 Two-Loop Renormalization of Quantum Gravity Simplified (SLAC) — https://www.slac.stanford.edu/pubs/sl... Experimental Search for Quantum Gravity (arXiv) — https://arxiv.org/abs/1010.3420 Fundamental Physical Constants (NIST) — https://physics.nist.gov/cuu/Constants/ CODATA Recommended Values of the Fundamental Physical Constants: 2022 (NIST) — https://tsapps.nist.gov/publication/g... — Disclaimer: All videos are produced for entertainment and education. Factual claims are sourced from peer-reviewed research and official scientific institutions. Where a video explores speculation, fringe theories, or the creator's own analysis, it is clearly labeled as such. Sundown Science is not a news outlet. Watch at your own discretion. #QuantumGravity #PlanckScale