Hi all, Here are few Black Hole related question. I’m more of a visual person and it’s been a while since my college Physics/Calculus days, so please excuse the lack of fundamentals. Given what we know about Black Holes, is there a widely accepted visualization of what it might look like? For example, is it fair to say that Black Hole “lacks” empty space? In other words, is it a region of space-time that is completely occupied by matter without any vacuum in between? If so, what form of matter is it composed of (quarks?). If the above were true, at what speed would sound (vibration) travel within the Black Hole? Would it still respect the speed limit of “c” or does this break down in a singularity? Are all Black Holes equally dense? By this I mean, is there a linear relationship between the size and the mass of Black Holes? Also, is this in any way confined to Plank’s constant? Finally, is there such thing as a quantum Black Hole? For instance, can the smallest known particle (or the matter that Black Holes are composed of) be considered a miniature Black Hole or are there restrictions in definition of something being called a Black Hole (such as size or minimum mass, etc.)? Thanks in advance for your replies.