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A space mile is a unit of distance that is [approximately] the length that spans one minute of arc on the [circumference] of the [observable universe], using any meridian. Using the results found by Cornish et. al in the paper titled "Constraints on the Topology of the Universe: Extension to General Geometries" the length of a space mile is currently defined as being 13526301.703 ly or about 4147183 parsecs.
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