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Astronomy and Cosmology
Cosmology
Discover the Universe from Unique Vantage Points | Your Ultimate Guide
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[QUOTE="kimbyd, post: 6813689, member: 622120"] That analogy doesn't follow, because the curvature of the Earth is spatial curvature, and the curvature of space-time which causes our universe's horizon is in space-time. The analogy only really works locally. Now, it is [i]possible[/i], as others have noted, that the universe wraps back on itself, but it would be a different effect than the one causing this horizon. Because of the horizon, we can't really say, because we can't see far enough. Various tests have tried to find effects of the universe wrapping back on itself, but so far there's no evidence of this. This indicates that if it does wrap, it's at a distance far beyond the horizon. Nobody knows how to say how likely or unlikely this is. Maybe someday if we figure out the physics of the very early universe, e.g., what caused inflation, then maybe we could say definitively if the universe wraps back on itself (some models for the early universe only allow universes that wrap back on themselves). But we're at best decades away from learning that. [/QUOTE]
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Discover the Universe from Unique Vantage Points | Your Ultimate Guide
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