Black Holes¶
A black hole is a matter so dense that even light cannot escape.
Schvarzchild radius \(R_s\)¶
If an aggregation of matter with total mass M has radius less than a critical value \(R_s\), than nothing cannot escape from its gravitational pull.
\[
R_s = \frac{2GM}{c^2}
\]
The event horizon is a sphere with radius \(R_s\) around a black hole.