From DeepSkyVideos.

The open cluster NGC 188 has retained an unusual population of middle-aged stars due to an orbit which spends long periods away from the messy galactic plane. More links and info in full description ↓↓↓

Discussed by Professor Mike Merrifield, emeritus professor from the University of Nottingham.

The cluster is also dubbed Caldwell 1, the first entry in Patrick Moore’s so-called Caldwell Catalogue of objects worth observing.

Paper: Accurate, Precise, and Physically Self-consistent Ages and Metallicities for 400,000 Solar Neighborhood Subgiant Branch Stars – https://arxiv.org/abs/2407.18307

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Astronomy at The University of Nottingham: https://www.nottingham.ac.uk/astronomy/

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Video by Brady Haran