Nul IV is a gas giant in the unclaimed Nul system, and is the fourth planet from its sun. A lightning storm that stretches across the entire world has been active on Nul IV at least since it was first observed in the late 2200s. Some spacecraft that attempt to refuel in the upper atmosphere in spite of the danger are often damaged beyond repair. Many of these wrecked ships end up in orbit around the gas giant or drift to its Lagrange points over time.