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About eighty years ago they concluded mathematically that when two photons collide an electron - positron matter set is formed from the collision. More recently they did the experiment...apparently proving it.
So if two electrons form matter through such colision then the photon-photon collision of trillions of photons given off by a star collide with the trillions of photons given off by another star (photon groups) collide forming photon group collision residue (an electron-positron web) interconnecting star systems and on an intergalactic scale of trillions of stars giving off photons and those groups colliding with photon groups from other galaxies photon group collision residue must form in intergalactic scale linking galaxies like a Web.
That would explain this Web.