
The universe is a concept that does not have a strict definition in astronomy and philosophy. It is divided into two fundamentally different entities: speculative (philosophical) and material, accessible to observation at the present time or in the foreseeable future. If the author distinguishes between these entities, then, following the tradition, the first is called the Universe, and the second - the astronomical Universe or the Metagalaxy (this term has practically fallen out of use recently).





























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