Given the recent mournful Caprica love here, this should gladden a few toaster-loving hearts: former showrunner Jane Espenson and science advisor Kevin Grazier (a JPL astronomer who works on the Cassini mission) have teamed up to release a spiffy annotated diagram of how twelve inhabited planets could hypothetically exist in one star system.
The map also includes short histories of all twelve colonies drawn in part from my own tiny contribution to BSG/Caprica lore. (The word "tiny" is not false modesty. It's really tiny.)