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I believe what you are looking for is spacetime which is the foundation that all of the universe exists on. My layman's understanding is that objects with mass "curve" or "bend" spacetime around them and this is actually how gravity effects objects. An object moving along a straight path (from it's perspective if on a small enough scale) which is actually following a curved path of spacetime will move in a curved path.
This gives a visual representation of the curving of spacetime.
This shows how a super massive object like a white dwarf or black hole distorts and eventually "breaks" spacetime.
This video also shows it visually fairly well.
Excellent comment, love the diagrams.
But we know spacetime is getting bigger, because the universe is expanding. So what is spacetime expanding into?
As i understand it it (somewhere between barely and not at all) the idea is not that It's "expanding" in the sense of a balloon inflating into the space around it.
Its more stretching internally.
So the distance (or time it would take at constant speed) between any 2 points is geting bigger.
You could maybe also say it'd take more energy to move between the points in a set time.
There's probably nothing outside, but the distances inside get longer.
It's probably something to go with gravity, momentum and entropy. The actual concept of "distance" between things might not be what we think.
But all these theories give rise to the concet of large amounts ob unobserved 'dark' mattter and evergy, so the actual basis of currently observable fact (i.e. energy / mass) is a small fraction of what is needed for these theories to work.