Based on the new hypothesis for electron and positron have been tested: They only have the electrical interaction but do not have the gravitational interaction, the author has presented the structural model of photon is electron-positron pair, they are completely suitable to all experiments. Because of having that structure, photon have not the mass in the electrical field, but it has the mass in the gravitational field. From here, the author has calculated the gravitational mass of photon ~4me, where me is the mass of electron. Using this mass value of photon to the calculation program on computer for the stars motion in the galaxies, the author receives the picture which is completely suitable to the observation result for the quick rotary of the galaxies as known. The nature of the dark matter has been discovered.
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New way for Physics 