J. Allen Hynek
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What links here
William Wilson Morgan
Donald Edward Osterbrock
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Galaxy morphological classification
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Antonia Maury
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Henry Norris Russell Lectureship
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Gérard de Vaucouleurs
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Bruce Medal
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Otto Struve
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McDonald Observatory
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William Morgan
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Yerkes Observatory
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The Astrophysical Journal
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Astronomical object
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Poplar Bluff, Missouri
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List of astronomers
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Stellar classification
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Main sequence
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June 21
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History of astronomy
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Edwin Hubble
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William W. Morgan
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