QUESTION 9 :   Imagine two stellar clusters, one recently formed and one very old, formed when our galaxy was very young. Which cluster is likely to have more heavy metals in its stars and Why?

a) The old cluster has more heavy metals because it has had more time to burn up the lighter elements (H, He, etc).

b) The older cluster has more heavy metals because it has had more supernova.

c) The younger cluster has more heavy metals because it has massive stars which will supernova.

d) The younger cluster has more heavy metals because it formed from gas enriched by previous supernova.

e) You can not tell without obtaining spectra of the stars which will have more metals.

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