What ACTUALLY Happens at the Planck Length?

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Thanks to Brilliant for sponsoring this video! Try everything Brilliant has to offer at https://brilliant.org/PhysicsExplained — and get 20% off an annual premium subscription. Each time we’ve built a new tool to look deeper into nature, we’ve uncovered hidden worlds — from cells and atoms to quarks and fields. But can we keep zooming in forever? At first, shorter wavelengths mean finer detail. Yet if we push far enough, the energy required to probe smaller regions would collapse spacetime itself, forming a black hole. This defines a fundamental boundary — the Planck length — where quantum mechanics and gravity meet, and the very concept of distance ceases to have meaning. 📚 References and Further Reading Possible Connection Between Gravitation and Fundamental Length — C. A. Mead (1964) Observable Consequences of Fundamental-Length Hypotheses — C. A. Mead (1966) Quantum Gravity and Minimum Length — Luis J. Garay (1994) Space-time is doomed! Introducing Planck scale physics in the classroom — Andrew M. Low (2024) Lectures on Particle Physics — David Tong (University of Cambridge) Quantum Gravity at the Planck Length — Joseph Polchinski (SLAC Summer Institute Lectures) Why Quantum Gravity is Hard — David Wakeham Quantum Gravity — Carlo Rovelli (Cambridge University Press) 🤝 Support the channel Patreon → https://www.patreon.com/physicsexplained 🔗 Follow me Instagram → https://www.instagram.com/physics_explained_ig X (Twitter) → https://twitter.com/PhysicsExplain1