New Open Questions

The Black Hole's center, which is a point of infinite density and zero volume, is considered a real physical entity, although it seems a mathematical artifact. So, Fact or Mathematical Artifact? Since no experiment has ever shown a density being infinite for a physical object in the universe, our question is what would be \textbf{the maximum discovered density }in the universe? Would it be possible to create any given density? What is the \textbf{strongest gravitational field} in the universe? What would be the maximum gravitational field to be produced in the laboratory? Similarly, what is the \textbf{strongest electric} field in the universe? What would be the \textbf{maximum electric field} to be produced in the laboratory? Similarly, what is the \textbf{strongest magnetic field} in the universe? What would be the \textbf{maximum magnetic field} to be produced in the laboratory?