How to View Beautiful Open Star Clusters Using Mobile Apps

These deep-sky objects, often overlooked in favor of the moon and planets, are visible all year round with unaided eyes — but binoculars or a backyard telescope make them shine.  While all of the cluster’s stars have a common “birthday,” they age at different rates depending on their mass. By comparing the aging massive stars with the smaller, younger stars, astronomers can study how stars of the same composition evolve over time.


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