One of the mysteries of the English language finally explained.
1An open cluster of stars which appear to share a common motion through space, and the distance of which can be determined from measurements of the motions of the individual stars.
2Attributive Designating a method of determining the distance of such a star cluster by observing the radial velocities and proper motions of the individual stars.
Early 20th century. From moving + cluster.
moving cluster/ˌmuːvɪŋ ˈklʌstə/
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