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  • This observable region is called the "Hubble volume". First time around, they had assumed that the Hubble volume could only fit within the universe in one way, like a jigsaw piece.

    Their original model predicted only a tiny minority of universes that could have inflated enough to fill the Hubble volume, so they discounted those universes as improbable.

    New Scientist, 28 June 2008

    July 14, 2008