Аннотация:We analyze some effects of axion decay on the background radiation. It is suggested that, in the mass range from 1 to 5 eV, the chances of detecting the axions astrophysically are higher than in other mass ranges; such a detection could lead to the resolution of the contradictory results given by the RELIKT and COBE (cosmic background explorer satellite) experiments concerning the percentage of CDM (cold dark matter) in the Universe.