Open Star Clusters

Firework galaxy star cluster​

Clusters of open star clusters

NGC 6520 and Barnard 86

Melotte 15 / Heart Nebula

NGC 7129 / open cluster

Owl Cluster

Double Clusters

M52, Bubble Nebula

Pleiades M45

Double star cluster

The Beehive Cluster 
M44

Pleiades & Venus