In one of the several Eucharistic prayers in the 1979 American Book of Common Prayer, the following language appears: "At your command all things came to be: the vast expanse of interstellar space, galaxies, suns, the planets in their courses, and this fragile earth, our island home."

I'm thinkin' that "the vast expanse of interstellar space" does, in a phrase, what you seek from a single word, eh?