star clusters:  open  vs.  globular

open clusters

(old name: galactic clusters)

globular clusters

hundreds - thousands of stars
tens of thousands - hundreds of thousands of stars
located in the plane or disk of our galaxy
located in the halo of our galaxy
younger than 10 billion years old
older than 11 billion years old
may contain gas and dust
very little, if any, gas and dust
   
examples
examples