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By the unified theory of dynamic space has been there a forecast of the follow observation that, parallel moving photons of different frequency, reduce locally the cohesive pressure of space, resulting to move with different speeds. So, the photons with higher frequency slow down against parallel moving photons with lower frequency, as on delay in gamma rays from galaxy Markarian 501 was observed. This observation proves that space contains unseen forces, which are evident as deformations of space, such as in the above theory are described. Accordingly, for the great problem of Physics and Philosophy, "What is the space?", there is the answer-solution: "The dynamic space".