Both wore on their cloaks the flaring sun-cluster emblem of Hercules Cluster.

He to act as ambassador to the great star lords of Hercules Cluster?

"I will report that to the Barons," said the chubby envoy of Hercules Cluster.

The star-decked vault of space near the gigantic ball of suns of Hercules Cluster seemed pricked with tiny flares.

The largest known globular cluster is the Great Hercules Cluster, M13, but it is not the closest.

The galaxies are part of the Hercules Cluster, which is itself part of the Great Wall.

In the Hercules Cluster, if I remember correctly.

The Hercules Cluster (Abell 2151) is a cluster of galaxies in Hercules.

Why has the TechnoCore built a replica of Rome in the Hercules Cluster?

"Hercules Cluster," he whispers.