Why do open clusters eventually dissipate over time?
Answer
They are gravitationally loose and lose stars to the influence of other objects
Open clusters lack strong, centralized gravitational density, which makes them gravitationally loose systems. Over time, the internal interactions between stars, as well as the external gravitational tugs from other galactic objects, cause individual stars to drift away from the group. This process leads to the gradual dissolution of the cluster, which is why open clusters are considered the younger, transient populations of the galaxy.
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