An angular momentum of a body that rotates, for example a star that revolves around itself, is said to be the product of the mass m by the radius r, by its rotation speed v.

A physical principle of fundamental importance is the so-called conservation of angular momentum: this tells us that if a rotating body contracts, that is, if the mass that forms it gathers in the center, the speed of rotation increases so that the The resulting angular momentum remains unchanged, and, conversely, if the mass is distributed to the periphery, the rotational speed decreases so that the angular momentum is maintained.

This principle finds an experimental verification in the simple observation that a dancer, who performs a movement with open arms, turns faster if she brings her arms closer to the chest.

In the cosmogonic field, the observation that most of the angular momentum of the solar system is concentrated on the planets (98 percent), while a minimum part is in the Sun itself (2 percent), represents almost the entire mass (99.9 percent) of the solar system has allowed us to formulate hypotheses about the origin consistent with this situation chart.

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