The Event Horizon and the Singularity of the Black Hole

There could be so many such black holes out there, and we will most likely never detect them. Obishak says, our black holes like solid balls, solid balls. What does it mean that the whole mass is concentrated at the singularity? Is it physically possible? Or is it just a mathematical outcome? Excellent questions. You ask these questions to your pysics professor, they'll say, shut up. Look at the equations. But this is how you develop the understanding, the curiosity, the conceptual foundation of what black holes actually are.