It seems to me that the evidence ... is opposed to the view that the spirals are individual galaxies comparable with our own. In fact, there appears as yet no reason for modifying the tentative hypothesis that the spirals are… — Harlow Shapley Copy Share Image
The evidence at present available points strongly to the conclusion that the spirals are individual galaxies, or island universes, comparable with our own galaxy in dimension and in number of component units. [Stating his conviction on the nature of nebulae… — Heber Doust Curtis Copy Share Image
