Messier 4 o M4 (etiam deignate NGC 6121) es un racemo globular in le constellation de Scorpion. Illo era discoperite per Phillipe Loys de Chéseaux in 1746 e catalogate per Charles Messier in 1764. Illo era le prime racemo globular in le qual stellas individual era resolvite.
Ligamines externe
- Paginas Messier de SEDS: de (Archivate 2011-08-11 al Wayback Machine) en fr it
- (anglese) M4, Galactic Globular Clusters Database page
