- Types:
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closed universe
(cosmology) a universe that is spatially closed and in which there is sufficient matter to halt the expansion that began with the big bang; the visible matter is only 10 percent of the matter required for closure but there may be large amounts of dark matter
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natural order
the physical universe considered as an orderly system subject to natural (not human or supernatural) laws
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nature
the natural physical world including plants and animals and landscapes etc.
