The real dramatic stuff comes at the center of the black hole, where the spacetime curvature becomes infinity. As you approach the center, you are torn apart by tidal forces. The gravitational pull on your feet becomes enormously more than that on your head….
For many years, it was questioned whether, or not, black holes existed and should be taken seriously.
There is now a wealth of evidence that supermassive black holes exist at the centers of many, or perhaps most galaxies and that they are responsible for many dramatic galactic phenomena...
COSMOS to HUMANITY, Spring 2008
Lecture 2 , slide 16