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Milky Way age's "Limiting Factors"[edit]

Current text gives some examples of limiting factors to the accuracy of chronological dating of the Milky Way. However, the example of an extremely metal-poor star (Cayrel's) begs the question: In which galaxy was this star formed -- the Milky Way (perhaps defined by its core & supermassive black hole, arguably the most stable parts), or one of the many galaxies it has "eaten" over the eons?

Is there any sense in which we can know whether this observation says anything about the Milky Way, so defined? Jmacwiki (talk) 05:04, 16 August 2011 (UTC)