3. Phoenix Cluster
The Phoenix Cluster is one of the largest galaxy clusters we have ever discovered. Observations of the galaxy show a continuous massive starburst that has not been seen in other galaxy observations.

Peter Korbas/Shutterstock.com
The Phoenix Cluster is one of the largest galaxy clusters we have ever discovered. Observations of the galaxy show a continuous massive starburst that has not been seen in other galaxy observations.
Peter Korbas/Shutterstock.com