Young Star Clusters in an Old Galaxy . ... ESO , ESA , NASA Explanation: Elliptical galaxy NGC 4365 is old, probably about 12 billion years old. ... NGC 4365's star clusters themselves appear as bright dots against a diffuse glow of unresoved starlight and fuzzy, distant background galaxies. ... Moving the cursor over the image identifies individual star clusters, with the relatively young (few billion year-old) clusters circled in blue, and the anticipated 12 billion year-old clusters circled in red. ...