Explosion is a traditional way of seeing something increase in size.<quoted text>
I don't get it. You call that simple? What do you mean by expansion of universe is free from matter, free of physical point?
What is the traditional way of sensing it?
Explosions are confined to within time , an event within space.
Expansion is the stretching of time and space.
Explosions do not make the total size of space or time larger, but spread things out within it.
Expansion makes the total size larger.
Explosion makes things spread out in space.
Expansion makes more space and time to spread matter out in.