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A flat universe is a model of the cosmos in which the large-scale geometry of space has zero curvature, meaning it adheres to the rules of standard Euclidean geometry. In a flat universe: Parallel lines remain parallel and never intersect. The angles of any triangle, no matter how large, sum up to exactly 180 degrees. The universe's average density of matter and energy precisely equals a value known as the critical density. Cosmological crisis: We don't know if the universe is round ... Flat uni
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