Stars are formed from interstellar matter. Why then are stars in open clusters metal-rich, while stars in globular clusters are metal-poor?
A) Open clusters contain very hot stars that produce metals by nuclear reactions in their outer layers.
B) Globular clusters have "burned" their heavy elements over their longer lifetime.
C) Globular clusters are too young for their stars to have produced any significant amount of metals.
D) 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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