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This over simplification might help or, it might not;
If you could imagine accelerating toward the edge of the known universe you can never reach it. As you go the edge continues to stretch out in front of you. You are part of this universe and can not ever leave that. where you go so does it.
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For 10^40 or so intervals of 10^-43 seconds after the big bang the universe is believed to have been largely photonic. Many of these photons must have been at or near the expansion horizon. When they reach it do they stick there or get reflected back; or are they the source of the continuing expansion?
Many posit that the expansion horizon is everywhere, including where we are-wherever that is, while avoiding tackling the problem of the scale at which expansion is nullified by the binding of bound objects and what causes that to be so. Are we into "hyper-epicycling"?
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For those inclined to oppose human meddling with the structure of the universe or the composition and configuration of objects and groups of objects within the universe, consider:
Whether there is a limit to the magnitude of a modulation of chaos below which order remains invariant? Or, is order but a fiction invented by perspectives applied over finite, however large, time intervals?
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