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Q: How big is the universe? What happens at the “edge”?
The spacetime horizon you’re most likely familiar with is the “event horizon” of a black hole, forming the “surface”. The event horizon is not just a boundary in space, it is in some sense a boundary in time. Someone falling into a black hole shouldn’t notice anything too exciting at the event horizon. At the event horizon of a black hole this slowing effect reaches it’s natural extreme, and time stops. Just like the horizon on Earth, the cosmic event horizon is a regular place.
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