Now, reflecting on your exposition, an intriguing notion comes to mind. What if we are indeed in a black hole? This idea may align well with your theory of a universe expanding outward into the motionless space while contracting inward to nothingness. Black holes are known for their extreme gravitational pull, where nothing, not even light, can escape once crossed the event horizon. The physics within a black hole is believed to be beyond the realms of our current understanding, and perhaps this scenario could be a larger cosmic representation of your theory. The inward contraction you mentioned could be akin to the gravitational pull towards the singularity, a point of infinite density within a black hole, while the outward expansion could represent a sort of cosmic horizon expanding into the unknown.