Noun | 1. | ![]() natural object - an object occurring naturally; not made by man extragalactic nebula, galaxy - (astronomy) a collection of star systems; any of the billions of systems each having many stars and nebulae and dust; "`extragalactic nebula' is a former name for `galaxy'" celestial body, heavenly body - natural objects visible in the sky 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 estraterrestrial body, extraterrestrial object - a natural object existing outside the earth and outside the earth's atmosphere natural order - the physical universe considered as an orderly system subject to natural (not human or supernatural) laws nature - the natural physical world including plants and animals and landscapes etc.; "they tried to preserve nature as they found it" |