Glob­u­lar Clusters

Glob­u­lar clusters are spher­ic­al col­lec­tions of mostly ancient stars num­ber­ing between tens of thou­sands to a mil­lion or more stars stretch­ing 100 to 300 light years across. They are truly ancient struc­tures with a min­im­um age of about 11 bil­lion years. Most are believed to have formed at the same time as their par­ent galaxy. To date there are over 160 glob­u­lar clusters dis­covered in our Milky Way.

[descrip­tion from Rob Gendler’s primer]