Star Clusters | Astronomy.com

Annotated astrophotograph of the Triangulum Galaxy (M33), a face-on spiral with a pale blue-white core, dark dust lanes, and sweeping blue spiral arms dotted with red and pink star-forming regions, set against a dark star field. A bright blue star with diffraction spikes appears at left. Small white labels with leader lines point to star clusters labeled C20, C27, C38, C39, H10, H38, M9, R12, R14, U49, U62, U77, and U137.

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A wide-field view of M44, the Beehive Cluster, showing a loose, sprawling grouping of bright, individually resolved stars scattered across the center of the frame. The cluster's most prominent members are large, brilliant blue-white stars, contrasted by several warm orange and golden stars interspersed among them. The cluster has no tight central concentration, spreading openly across the field with a rich background of much fainter stars visible throughout the deep black sky.

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