„Shapley–Curtis-vita” változatai közötti eltérés

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7. sor:
A vitára 1920. április 26-án került sor a [[Smithsonian Intézet]] ''Spencer Baird'' előadóteremében. A megbeszélést az Amerikai Tudományos Akadémia rendezte.<!-- a társaság nevének utána kell nézni, hogy biztos legyen -->
 
A két csillagász a nap folyamán független elemzéseket mutatott be „a világegyetem mérete” témában, majd este megbeszéléseket tartottak. A „nagy vita” elnevezés (ahogy angolul nevezik: „Great Debate”) két írásból született, amiket Shapley és Curtis „az amerikai nemzeti kutatási tanács” 1921. év májusi ''Értesítő''-jében jelentetett meg. Mindkét írás tartalmazta az ellenérveket is, amik az 1920-as találkozáson elhangzottak.
 
 
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The two scientists first presented independent technical papers about "The Scale of the Universe" during the day and then took part in a joint discussion that evening. Much of the lore of the Great Debate grew out of two papers published by Shapley and Curtis in the May 1921 issue of the ''Bulletin of the [[United States National Research Council|National Research Council]]''. The published papers each included counter arguments to the position advocated by the other scientist at the 1920 meeting.
 
Shapley was arguing in favor of the [[Milky Way]] as the entirety of the universe. He believed galaxies such as [[Andromeda Galaxy|Andromeda]] and the Spiral Nebulae were simply part of the Milky Way. He could back up this claim by citing relative sizes—if Andromeda was not part of the Milky Way, then its distance must have been on the order of 10<sup>8</sup> [[light years]]—a span most [[astronomy|astronomers]] would not accept. [[Adriaan van Maanen]] was also providing evidence to Shapley's argument. Van Maanen was a well-respected astronomer of the time who claimed he had observed the [[Pinwheel Galaxy]] rotating. If the [[Pinwheel Galaxy]] were in fact a distinct galaxy and could be observed to be rotating on a timescale of years, its orbital velocity would be enormous and there would clearly be a violation of the universal speed limit, the [[speed of light]]. Also used to back up his claims was the observation of a [[nova]] in the Andromeda galaxy that had temporarily outshone the nucleus of the galaxy itself, a seemingly absurd amount of energy for a normal nova. Thus, the nova and the galaxy itself must be within our own galaxy since, if Andromeda were a galaxy in its own right, the nova would have had to have been unthinkably bright in order to be seen from so far away.