Hayashi limit

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What Wikipedia says

The Hayashi limit is a theoretical constraint upon the maximum radius of a star for a given mass. When a star is fully within hydrostatic equilibrium—a condition where the inward force of gravity is matched by the outward pressure of the gas—the star can not exceed the radius defined by the Hayashi limit.

Excerpt from the Wikipedia article “Hayashi limit”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Praemonitus, CC0, via Wikimedia Commons.