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Of the first two relativistiv world models, only the one by de Sitterpredicted redshifted spectra from far away astronomical objects. Slipher'sredshifts therefore seemed to arbitrate against Einstein's model which made nosuch predictions. Both models were trying to describe a static universe.However, Lemaitre found that de Sitter's construct resulted in a spatiallyinhomogeneous universe. He then opted for a model that correspondes toEinstein's closed, curved universe but allowed the radius of curvature tochange with time. Slipher's redshifts suggested to him that the universe isdynamic and expanding. We also discuss the respective merits of Friedman andLemaitre in revealing the dynamic nature of the universe.

Slipher's redshifts as support for de Sitter's model and the discovery of the dynamic universe