نصف قطر شفارتزشيلد: الفرق بين النسختين

The Schwarzschild radius (sometimes historically referred to as the '''gravitational radius''') is the distance from the center of an object such that, if all the mass of the object were compressed within that region, the escape speed would equal the speed of light. Once a stellar remnant collapses within this radius, light cannot escape and the object is no longer visible.<ref>Chaisson, Eric, and S. McMillan. Astronomy Today. San Francisco, CA: Pearson / Addison Wesley, 2008. Print.</ref> It is a characteristic [[radius]] associated with every quantity of [[mass]]. It is the radius of a sphere in space, that if containing a correspondingly sufficient amount of mass (and, therefore, reaching a certain density), the force of gravity from the contained mass would be so great that no known force or [[Degenerate matter|degeneracy pressure]] could stop the mass from continuing to collapse in volume into a point of infinite density: a [[gravitational singularity]] (colloquially referred to as a [[black hole]] because no light can escape it). The term is used in [[physics]] and [[astronomy]], especially in the theory of [[gravitation]], and [[general relativity]].▼