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Which of these comes closest to how you picture the expansion of space?
As an explosion from a central point with galaxies flying away from the center of the explosion?
As the 3D analog of the surface of a balloon?
As the 3D analog of an infinite flat sheet of graph paper on which the squares are gradually getting bigger? (suggested by PF poster jcsd recently)
As an infinite loaf of bread-dough expanding by the action of yeast
As a humongous inflatable donut
As an explosion from a central point with galaxies flying away from the center of the explosion?
As the 3D analog of the surface of a balloon?
As the 3D analog of an infinite flat sheet of graph paper on which the squares are gradually getting bigger? (suggested by PF poster jcsd recently)
As an infinite loaf of bread-dough expanding by the action of yeast
As a humongous inflatable donut