A stellar cluster, stellar group, or star cluster was a group of stars held together by gravity.
In July 2151, Enterprise NX-01 detected a cluster of three neutron stars. (ENT: "Civilization")
In 2151, shortly before passing out after being shot by Suliban on Rigel X, Jonathan Archer thought he should be mapping star clusters or making peaceful first contacts, not getting into firefights. One year later, he shared this memory with Tessic. (ENT: "Marauders")
The Federation established a colony in the Strnad solar system inside a stellar cluster of over three thousand stars in 2364. This cluster was claimed by the Edo God. (TNG: "Justice")
In 2366, the Astrophysics Center on Icor IX held a symposium on rogue star clusters, which Jean-Luc Picard considered to attend. (TNG: "Captain's Holiday")
USS Voyager visited a cluster undergoing several supernovae in 2373. (VOY: "The Q and the Grey")
A star cluster was located in Grid 1421. Nearly half of the planets in the cluster were habitable, but by 2376 they had been occupied by the Borg. (VOY: "Dragon's Teeth")
Types of clusters