Brian Cox: The Planck scale is where physics breaks

What happens when you try to look too closely at the fabric of the universe? When we gaze at a Planck length, a scale so small that even light becomes useless for observation, physics pushes back. 

The Planck length is not just a tiny number, it’s a boundary where gravity, quantum mechanics, and relativity collide. Physicist Brian Cox explains why the measurement is a portal to the deep structure of reality, and why going beyond it may break the boundaries of our understanding.

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