law of conservation of angular momentum-video/printing

Red Giant Suns -
The core burns down, creating upward and outward heat pressure arising from the additional compression of the inner energy fusion core by the downward gravity of the outer hydrogen gases, all exerting further upward pressure on the surface hydrogen gases while maintaining angular momentum.

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Law of Conservation of Angular Momentum

The rotational analog of linear momentum is naturally angular momentum.

The angular momentum of a system remains constant unless acted on by an external torque or rotational force about an axis, fulcrum, or pivot.

The burning down of a Red Giant star is a good example of the conservation of angular momentum. Gyroscopes for spacetime in general relativity by their very nature as well exhibit the law of conservation of angular momentum similarly as do flywheels in down-to-earth mechanical engineering physics.