From publisher blurb:
One of the drop in resolution sub-systems for StarCluster 3, In Harm's Way: StarCluster, and Commonwealth Space.
The StarNova Sub‐System uses a d6 dice pool to play. All rolls are made with d6, and the Sub‐system uses the Starnova Character Sheet along with the Character Generation Worksheet.
User note: freely available on the publisher website as a distinct file.