One of the topologies possible for the universe is a Euclidian 3-torus. Although hard to visualise in three dimensions, the equivalent for a two-dimensional space is a 2-torus: a simple doughnut.
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Imagine a two-dimensional sheet. Two edges can curve to meet, making a cylinder, and the ends of that would loop around to form a ring shape.
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In this scenario, light would travel from one galaxy to another in different directions and multiple instances of it would be visible. Although finite, the endless line of sight would give the impression of infinite space.
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One of the topologies possible for the universe is a Euclidian 3-torus. Although hard to visualise in three dimensions, the equivalent for a two-dimensional space is a 2-torus: a simple doughnut. Imagine a two-dimensional sheet. Two edges can curve to meet, making a
cylinder, and the ends of that would loop around to form a ring shape. In this scenario, light would travel from one galaxy to another in different directions and multiple instances of it would be visible. Although finite, the endless line of sight would give the impression of infinite space.
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