Supernova/meta

According to the Galaxiad: Era 1900 documents:

As predicted by Imperial astrophysicists, Antares will go supernova in 1270. The supernova will destroy all life within a four parsec radius, and kill any colonies within eight parsecs -- and any colonies unprotected by a substantial atmosphere or strong heliosphere up to 12 parsecs distant. For a century afterward, these systems will be bathed in hard radiation. The supernova will appear in the Regina sky in the mid-1600s.