Schwarzschild radius
The Schwarzschild Radius is the radius of a sphere such that, if all of an object's mass were to be compressed within that sphere, it would become a black hole. This value is proportional to the mass of the object: the more massive it is, the larger the Schwarzschild Radius. For example, the Earth’s Schwarzschild Radius is about 9 millimeters. Within this radius, the gravitational pull becomes so strong that not even light can escape, making it impossible to see anything inside, hence the term "black hole."
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The Schwarzschild radius is a specific radius around a black hole within which nothing can escape its gravitational pull, not even light. It is calculated based on the mass of the black hole; the more massive the black hole, the larger the radius. For example, a black hole with a mass equal to that of our Sun has a Schwarzschild radius of about 3 kilometers. This concept helps us understand the boundary of a black hole, marking the point of no return for objects falling into it. Beyond this radius, escape becomes impossible due to immense gravity.