Renowned scholar Dr.W. Randolph, who in his recent research Buddhist Cosmology writes that ‘The Buddha refused to answer these questions because they were vain and had no significance for salvation. All of the proposed alternatives are rejected by tradition as false or heretical. The scholastic difficulties inherent in apparent corollaries of these positions shed additional light on the implications of these cosmological questions.’
However, denying the importance of these cosmic speculations could "not prevent his followers from accepting the general cosmological beliefs of their time, modified by conclusions drawn from his specific moral and religions teachings" says Encylopeadia Britanica. It further states that the cosmic phenomenon of creation, destruction and recreations are inevitable process ! Nothing is of permanent nature or transcendental within the scope of the concept called "realm of desire", wherein gods, human being and other impermanence creatures are nothing but embodiment of impermanence.