Why Everything in the Universe Spins | Leonard Susskind

Описание: From planets and stars to galaxies and even fundamental particles, rotation appears everywhere in the universe. Nothing seems to remain perfectly still.

But why?

In this video, we explore why spin and rotation are universal features of physical systems. Drawing on principles associated with Leonard Susskind and modern theoretical physics, this documentary examines the deep connection between symmetry and conservation laws.

When clouds of gas collapse under gravity, they begin to rotate. As the radius shrinks, the rotation speeds up. This is not coincidence. It is the conservation of angular momentum — a fundamental principle built into the structure of physical law.

But the story goes deeper.

In quantum physics, particles possess intrinsic spin. This is not literal spinning like a tiny ball rotating in space. It is a built-in property tied to the mathematical symmetries of spacetime itself.

Rotation is not merely a mechanical outcome of motion. It is connected to how the universe preserves symmetry. Through Noether’s theorem, we understand that every symmetry corresponds to a conservation law. Rotational symmetry gives rise to angular momentum conservation.

This means that spin is not accidental.

It is encoded into the geometry of spacetime.

The universe rotates because the laws of physics demand consistency under rotation. What appears dynamic and chaotic at large scales is deeply rooted in abstract symmetry principles.

Spin is not just everywhere.

It is fundamental.