Not until the final paragraph of his 1929 paper did Hubble mention de Sitter, or indeed theory at all. And then Hubble simply noted that the velocity-distance relation might represent the de Sitter effect and might be of interest for cosmological discussion. Hubble emphasized the empirical, observational aspect of his work. His chief goal was to convince skeptical readers that the velocity-distance relation really existed.Hubble's 1929 velocity-distance relation for 46 nebulae. The black dots and the solid line represent the solution obtained from the 24 nebulae for which individual distances were determined, using them separately. Empty circles and the dashed line represent the solution obtained by combining the nebulae into groups. The cross represents the mean velocity for a set of 22 nebulae whose distances could not be estimated individually.
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