Edwin Powell Hubble1953
Edwin Hubble and Allan Sandage publish a study of the brightest variable stars in M31 and M33, refining observations of luminous variables used in the extragalactic distance-scale programme.
United States of America · Science / Astronomy. Chronological records rendered directly from the World History Database.
Edwin Hubble and Allan Sandage publish a study of the brightest variable stars in M31 and M33, refining observations of luminous variables used in the extragalactic distance-scale programme.
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