The term used to describe loose, open groups of related stars. Such clusters tend to be young, with the stars that make them up often having formed together. The Pleiades is an example of a comparatively bright and nearby open cluster.
The Wishing Well Cluster (C91 or NGC 3532) is one of the brightest and most prominent open clusters in the sky. It lies against the band of the Milky Way as it passes through Carina, close to the extensive Eta Carinae Nebula. Imagery provided by Aladin sky atlas
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