JK photometry of NGC 2808
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Globular clusters are the oldest stellar systems in the Milky Way, and they probe the early epoch of the Galaxy formation. However, the uncertainties on their absolute age are...
球状星团（Globular Clusters）是银河系中最为古老的恒星系统，可用于探测星系形成的早期纪元。然而，其绝对年龄仍存在诸多不确定性……
