Abstract
In 1924 Edwin Hubble published his first paper demonstrating the extragalactic nature of a “nebula”, the dwarf irregular galaxy NGC 6822 (Hubble 1925). A year later he presented a long and exacting paper on M33 that clearly demonstrated that it is also a distant stellar system (Hubble 1926).
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References
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Hodge, P. (2012). Hubble’s Pioneering Study. In: The Spiral Galaxy M33. Astrophysics and Space Science Library, vol 379. Springer, Dordrecht. https://doi.org/10.1007/978-94-007-2025-1_3
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DOI: https://doi.org/10.1007/978-94-007-2025-1_3
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