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==Nature of a Black Hole==
==Nature of a Black Hole==
===Math===
===Mathematics===
There are several solutions of the Einstein field equations that are used to model black holes. The simplest of these is the Schwarzchild metric. From this metric, one kind calculate the Schwarzschild radius, which defines the boundary of the black hole, to be
:<math>r_s=\frac{2*G*m}{C^2}</math>
:<math>r_s=\frac{2GM}{c^2}</math>,
where
where
* r<sub>s</sub> is the Schwarzschild radius;
* r<sub>s</sub> is the Schwarzschild radius;
* G is the gravitational constant;
* G is the gravitational constant;
* M is the mass of the gravitating object;
* M is the mass of the gravitating object;
* C is the speed of light in vacuum.
* c is the speed of light in vacuum.
===Time and Distance===
===Time and Distance===