What lies beyond the observable universe if its visible edge is not a wall in space, but a limit set by light and time? This calm science documentary explains why looking farther away means looking deeper into the past, and how cosmic expansion places some regions permanently beyond our reach.

We will approach the cosmic microwave background, explore the cosmic event horizon, and carefully consider models of infinite or closed space and eternal inflation. Settle in for a gentle journey to the boundary of what can be known, designed for quiet listening before sleep. What might exist beyond a horizon that no signal can ever cross?

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