What exact is meant by the expansion of the universe? It is an expansion of the outer borders of the universe (if there is such a thing)? Or is it an expansion of every single point within the universe?
I’m curious because of the implications it would have on my layman’s understanding of the Big Bang, various natural laws in the universe, and black holes. Right now I’m working with the assumption that it expands from every point, please correct me if I’m wrong.
For example, if space is constantly expanding at every point, how does this effect the structure of an atom? Wouldn’t the space between the neutrons and protons continue to increase, to the point where eventually, the atoms couldn’t maintain it integrity? Same for the proton itself, wouldn’t the space between its quarks eventually become so great that it would eventually rip it apart?
Inside a black hole, wouldn’t the constant expansion of space eventually dissolve the black hole, as the gravitational forces became weaker?
Any help would be greatly appreciated?