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- Great_Debate_(astronomy) abstract "In astronomy, the Great Debate, also called the Shapley–Curtis Debate, was an influential debate between the astronomers Harlow Shapley and Heber Curtis which concerned the nature of spiral nebulae and the size of the universe. The basic issue under debate was whether distant nebulae were relatively small and lay within our home galaxy or whether they were large, independent ones. The debate took place on 26 April 1920, in the Baird auditorium of the Smithsonian Museum of Natural History. 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 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 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 108 light years—a span most 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.Curtis on the other side contended that Andromeda and other such nebulae were separate galaxies, or "island universes" (a term invented by the 18th-century philosopher Immanuel Kant, who also believed that the spiral nebulae were extragalactic). He showed that there were more novae in Andromeda than in the Milky Way. From this he could ask why there were more novae in one small section of the galaxy than the other sections of the galaxy, if Andromeda was not a separate galaxy but simply a nebula within our galaxy. This led to supporting Andromeda as a separate galaxy with its own signature age and rate of novae occurrences. He also cited dark lanes present in other galaxies similar to the dust clouds found in our own galaxy and massive doppler shifts found in other galaxies.Curtis stated that if van Maanen's observation of the Pinwheel Galaxy rotating were correct, he himself would have been wrong about the scale of the universe and that the Milky Way would fully encompass it.".
- Great_Debate_(astronomy) thumbnail Andromeda_galaxy.jpg?width=300.
- Great_Debate_(astronomy) wikiPageExternalLink 1995PASP..107.1133T.
- Great_Debate_(astronomy) wikiPageExternalLink debate20.html.
- Great_Debate_(astronomy) wikiPageExternalLink scaleofuniverse00shap.
- Great_Debate_(astronomy) wikiPageID "1352262".
- Great_Debate_(astronomy) wikiPageRevisionID "599017206".
- Great_Debate_(astronomy) hasPhotoCollection Great_Debate_(astronomy).
- Great_Debate_(astronomy) subject Category:1920_in_science.
- Great_Debate_(astronomy) subject Category:1920_in_the_United_States.
- Great_Debate_(astronomy) subject Category:Debates.
- Great_Debate_(astronomy) subject Category:History_of_astronomy.
- Great_Debate_(astronomy) subject Category:Physical_cosmology.
- Great_Debate_(astronomy) type Abstraction100002137.
- Great_Debate_(astronomy) type Argument107140978.
- Great_Debate_(astronomy) type AuditoryCommunication107109019.
- Great_Debate_(astronomy) type Communication100033020.
- Great_Debate_(astronomy) type Debates.
- Great_Debate_(astronomy) type Discussion107140659.
- Great_Debate_(astronomy) type Speech107109196.
- Great_Debate_(astronomy) comment "In astronomy, the Great Debate, also called the Shapley–Curtis Debate, was an influential debate between the astronomers Harlow Shapley and Heber Curtis which concerned the nature of spiral nebulae and the size of the universe. The basic issue under debate was whether distant nebulae were relatively small and lay within our home galaxy or whether they were large, independent ones. The debate took place on 26 April 1920, in the Baird auditorium of the Smithsonian Museum of Natural History.".
- Great_Debate_(astronomy) label "Grand Débat (astronomie)".
- Great_Debate_(astronomy) label "Grande Dibattito".
- Great_Debate_(astronomy) label "Great Debate (astronomy)".
- Great_Debate_(astronomy) label "Shapley-Curtis-Debatte".
- Great_Debate_(astronomy) label "Wielka Debata".
- Great_Debate_(astronomy) label "Большой спор".
- Great_Debate_(astronomy) label "沙普利-柯蒂斯之争".
- Great_Debate_(astronomy) sameAs Shapley-Curtis-Debatte.
- Great_Debate_(astronomy) sameAs Grand_Débat_(astronomie).
- Great_Debate_(astronomy) sameAs Grande_Dibattito.
- Great_Debate_(astronomy) sameAs 대논쟁_(천문학).
- Great_Debate_(astronomy) sameAs Wielka_Debata.
- Great_Debate_(astronomy) sameAs m.04w0j0.
- Great_Debate_(astronomy) sameAs Q278891.
- Great_Debate_(astronomy) sameAs Q278891.
- Great_Debate_(astronomy) sameAs Great_Debate_(astronomy).
- Great_Debate_(astronomy) wasDerivedFrom Great_Debate_(astronomy)?oldid=599017206.
- Great_Debate_(astronomy) depiction Andromeda_galaxy.jpg.
- Great_Debate_(astronomy) isPrimaryTopicOf Great_Debate_(astronomy).
