“The eighteenth-century German philosopher Immanuel Kant had conjectured that Messier's nebulae were distant "island universes" outside our Milky Way galaxy, but many scientists in the early twentieth century disagreed.”

—  John Moffat, book Reinventing Gravity

Source: Reinventing Gravity (2008), Chapter 3, The Beginning Of Modern Cosmology, p. 54

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British-Canadian physicist 1932

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