Phlogista

aka the Sun Planet: the fourth world in the Lucichuacanis system. While its fiery surface and surface resemble a yellow sun, Phlogista maintains a planetary orbit and generates insufficient heat and light to affect its neighbors. With surface temperatures in the five- to six-figure range, Phlogista remains untouched by explorers, although many worlds covet it as an energy source. It is not known whether the planet sustains some hidden form of life. -Encyclopedia Galactica

The Legion discovered that Phloigista is inhabited by a sub-molecular network fo civilizations known as the United Molecules.