It is entirely possible that the anti-event horizon (the periphery of the visible universe where matter forms or is annihilated, and we cannot see beyond) is beyond our ability to verify through observation: the visible universe within the subatomic particle accretion mass may be much larger than the visible universe that we can actually see, extending beyond lights' ability to travel to earth and thus reveal it, according the current age of our local visible universe.

For example, if the diameter of the physical universe is 100 billion years in diameter, and our local area of the visible universe is only 15 billion years in diameter, the light from the outer periphery of the physical universe might not reach earth from any time between tomorrow, if we are located near an outer wall of this construct, to 35 billion years, if we are near the center of the construct.

If however, the visible universe equals the physical universe, then no such problems of observing the anti-event horizon will be encountered. It is likely that visible universe=physical universe as the cosmic background radiation-anti-event horizon can be ascertained using instrumentation.