No one on earth knows. The universe hasn't been measured, and we may never reach the ends of the universe, if the universe ever ends.
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There are four edges that join this side to the opposite side.They are all equal length. That could give us a clue.The distance between two opposite sides is just the length of any edge of the cube.
Bow Calipers is a device used to measure the distance between two opposite sides of an object.
A quadrilateral with opposite sides parallel & having unequal diagonals.The distance of diagonals/sides is calculated by the distance formula.
By numbers at the same distance but on opposite sides of zero.
These two numbers are:* At opposite sides of the number zero, and* At the same distance from the number zero.