Abstract: In recognition of the fact that the absolute temperature and Newton，s absolute time only gain meaning with respect to the physical laws wherein they are introduced and thus defined, we speculate that the theory of gravitation and the grand unified theory may imply two differing time scales that might manifest their difference in the history of the Universe. With a proper incongruity between the two time scales, the horizon problem may find a solution in a rather natural way, and the concept of dark energy may become dispensable. A mutual reference of the period of revolution for a binary star system versus the decay time of some physical processes thereon governed by the grand unified theory, say the X-ray emission from X-ray binaries, and measured in such a system at various distances from now, is anticipated to provide an observational verification to the speculation.