Persistence is the closest world to Independence’s giant star.  Over six times as far away as Earth from our Sun, the immense amount of solar radiation and a very strong greenhouse effect keeps the world uncomfortably hot for most people.  Lethally toxic and corrosive compounds in the atmosphere make it a challenge to live on, but it is home to a true mother lode of rich minerals.  This makes it the heart of the industrial presence in the Independence star system.