globular

adj. round; shaped like a globe; drop-like

A globular cluster is a spherical collection of stars that orbits a galactic core  as a satellite. Globular clusters are very tightly bound by gravity, which gives them their spherical shapes and relatively high stellar densities toward their centers. Globular clusters, which are found in the halo of a galaxy, contain considerably more stars and are much older than the less dense galactic, or open clusters, which are found in the disk.
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Adjective
1. having the shape of a sphere or ball; "a spherical object"; "nearly orbicular in shape"; "little globular houses like mud-wasp nests"- Zane Grey
(synonym) ball-shaped, global, globose, orbicular, spheric, spherical
(similar) round, circular

adj. globular, round; shaped like a globe; drop-like

adj. globular, round