List of astronomical observatories
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Yerkes Observatory
1909 in science
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Grote Reber
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Refracting telescope
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Gerhard Herzberg
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History of the telescope
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Mount Wilson Observatory
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List of largest optical refracting telescopes
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Lick Observatory
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George Willis Ritchey
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Subrahmanyan Chandrasekhar
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Williams Bay, Wisconsin
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Poplar Bluff, Missouri
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Observatory
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Gerard Kuiper
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Halley's Comet
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Pluto
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Charles Yerkes
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University of Chicago
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Stellar classification
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Edwin Hubble
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Clyde Tombaugh
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