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Red-shifts are produced either in the nebulae, where the light originates, or in the intervening space through which the light travels. If the source is in the nebulae, then red-shifts are probably velocity-shifts and the nebulae are receding. If the source lies in the intervening space, the explanation of red-shifts is unknown, but the nebulae are sensibly stationary.

— Edwin Hubble

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Wikiquote does not flag this quote as disputed or misattributed.

Source: as quoted by Gerald James Whitrow, The Structure and Evolution of the Universe: an Introduction to Cosmology (1959)
Source quality: Secondhand citation Quoted from another book or article rather than from the original.

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Attribution

Quote text and notes from Wikiquote: Edwin Hubble (page history), available under CC BY-SA 4.0. Source quality and labels are our own summary of what Wikiquote records.