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An Exploration Cluster is a Sector where the various random Exploration missions can be found.
In an Exploration Cluster you will find the various Exploration missions. While in Federation Space only one Cluster is attached to each Sector Block you will find all Klingon Clusters are attached to the Omega Leonis Sector Block.
Upon entering a cluster you will see the vastness of space, with little red anomaly dots showing up. When you get near them you get one of two options, either you found an anomaly that will trigger the Scanning Minigame or that let's you enter a random system to explore.
 List of Federation Clusters
 Klingon Front
 Romulan Front
 Cardassian Front
 Borg Front
- All Clusters share the same basic layout, only the orientation differs from Cluster to Cluster.
- While the exploration missions seem random at first glance, they are not random at all. They are pulled from a huge pool of predefined missions. So after a while you will get a mission you have already done.