Wright proposed a model of the Milky Way as a flat wheel, and envisioned the nebulae as distant worlds upon worlds, far removed from the Milky Way itself.“That this in all Probability may be the real Case, is in some Degree made evident by the many cloudy Spots, just perceivable by us, as far without our starry Regions, in which tho’ visibly luminous Spaces, no one Star or particular constituent Body can possibly be distinguish’d; those in all likelyhood may be external Creation, bordering upon the known one, too remote for even our Telescopes to reach.” (Wright, pp. 83–84)