It is my theory that all of matter can be described as "intersections of magnetic parabolas". Someone suggested "interesections of physical parabolas", and I kind of agree, however magnetic parabolas is easier to think about.
Anyhow, viewing matter as the intersections of magnetic parabolas explains black holes as well as electrons and quarks. What happens to the "matter" at the center of black holes? Is it "infinitely dense" as some theories are forced to support? Or is it a smoothing out of the competing magnetic parabolas? Rather than posit an exit of a wormhole or something, magnetic parabolas explains without entering a new something into the equation.
Speaking of equations, it also explains infinite at both sides of the equation (going to zero and going to maximum). There is no maximum except to the extent that a red dwarf has a maximum mass.
For more, see http://keihatsu-moleculardynamics.blogspot.com
FYI, E=mc2 is an interesting equation. As all of mathematics it is an approximation of reality and not reality itself. It is my belief that c2 approximates the intersections of magnetic parabolas, but does not accurately measure or account for all phenomena.