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Stars are formed from interstellar matter. Why then are stars in open clusters metal-rich, while ...

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Stars are formed from interstellar matter. Why then are stars in open clusters metal-rich, while ...

Stars are formed from interstellar matter. Why then are stars in open clusters metal-rich, while stars in globular clusters are metal-poor?
A)   Because open clusters contain very hot stars that produce metals by nuclear reactions in their outer layers
B)   Because globular clusters have “burned” their heavy elements over their longer lifetime
C)   Because globular clusters are too young for their stars to have produced any significant amount of metals
D)   Because open clusters are young and stars have formed from material that has been enriched in metals by supernova explosions of previous stars

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Discovering the Universe

Edition: 7^th

Authors: Kaufmann, Comins

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