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United States astronomer who discovered that (as the universe expands) the speed with which nebulae recede increases with their distance (1889-1953) Edwin Hubble , Edwin Powell Hubble , Hubble
(astronomy) a collection of star systems; any of the billions of systems each having many stars and nebulae and dust extragalactic nebula , galaxy
United States astronomer who studied sunspots and nebulae (1818-1889) Maria Mitchell , Mitchell
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