Journal article Open Access
The explanation of the red shift in spectra of remote galaxies and cosmic microwave background radiation from the concept of an expanding Universe seems inadequate, and invites other explanations. The present paper studies the idea of cosmic red shift and microwave background radiation as a consequence of interaction between photons and previously unknown particles. It shows that the overall mass of the new particles in the Universe has the same order of magnitude as the mass of all the nucleons. Thus the problem of invisible dark matter may be solved. The question must be raised about the need for the existence of dark energy. In particular, the effect of attenuation of radiation from the distant supernovas is considered to be the consequence of scattering of photons on the new particles, but not the result of the dark energy activity.