The recent achievements in cosmology and particle physics lead to surprising conclusions. They suggest the existence of many different – from Ours – multiverses. The hypothesis of a multiverse appears as a consequence of considerations both in the biggest scale, on the grounds of the so-called theory of eternal chaotic inflation and in the smallest possible scale – as a conclusion that follows from the theory of superstrings, articulated as the proposal of the so-called cosmic ‘landscape’. The conception of a multiverse could explain in a rational way the origin of our Universe, the way of its coming into existence, as well as the details of its functioning, and the issue of its ‘fine-tuning’ to the development of life. But, are the speculations concerning multiverses, which we will never be able to see, based on the theories which perhaps will never be testable empirically – still science or already (unjustly) philosophy?
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