What is the ultimate fate of an open cluster (or galactic cluster) of stars?
A) It is torn apart by collisions with giant molecular clouds.
B) Its stars finish their lives and explode as supernovae, until eventually there are no stars left.
C) It gradually becomes more compact until the stars in it merge and collapse to become a supermassive black hole.
D) Its stars escape one by one until the cluster no longer exists.
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