| http://www.w3.org/ns/prov#value | - Well, changes could include such things as temperature, pressure, chemical composition, and a whole array of other features, such as mass, size, luminosity, most of which are determined by the first three.Astronomers know these features change, albeit very slowly (usually).I???ll discuss the rather sudden changes later on, but more important, is to begin to explain how we know stars are evolving e
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