Answer:
All stars in the cluster are approximately the same age.
Step-by-step explanation:
An open cluster refers to a group of around a thousand stars such that these stars are surrounded by the nebula. All-stars in the cluster are approximately the same age. Milky Way consists of more than 1000 such open clusters.
Examples of an open star cluster areas follows:
1. Beehive
2. Hyades
3. Pleiades