Edwin Powell Hubble1926
Hubble publishes his morphological classification of extragalactic nebulae, including elliptical, normal spiral, barred spiral and irregular systems, forming the basis of the Hubble sequence.
United States of America · Science / Astronomy. Chronological records rendered directly from the World History Database.
Hubble publishes his morphological classification of extragalactic nebulae, including elliptical, normal spiral, barred spiral and irregular systems, forming the basis of the Hubble sequence.
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