Rosetta Nebula is a Cluster in Mass Effect 2 located at 5200 light years from Earth and features 3 Systems and .8 Planets. Rosetta Nebula can be unlocked after completing Jacob: The Gift of Greatness. In Mass Effect 2, the galaxy is divided into Clusters, Systems, and Planets. Inside each Cluster you can find a different number of Systems, and within each System you will find mainly Planets, but also Satellites. Below you can find all the Systems and Planets within Rosetta Nebula.
All Systems in Rosetta Nebula