Jupiter Brains (A1-0)
A Jupiter Brain (also known as a J-Brain) is a computational substrate megastructure, comparable in mass and size to a gas giant planet, typically in the 1x1027 kilogram range. Due to the required amount of resources, they are very rare, with only a couple of them existing in the Galactyan Empire.
Structure
The computronium basis of a modern Jupiter Brain usually consists of a colloidal structure of Plasma, Low Density Monopolium, Diamondoid and Feroid.
Heat dissipation is often a major concern with Jupiter Brains; the denser they are, the faster they can run, due to the distances involved in transmitting internal data. But increasing the density of the computronium also increases the problems associated with the heat of operation. The number of computations that a Jupiter brain performs in a given time is directly related to the amount of waste heat the brain must emit, and since this heat must be emitted at the surface of the structure, very often a J-brain has a very large external radiating surface which helps to cool the object.
Some Jupiter Brains are sufficiently luminous to act as the center of a system of habitable moons or other megastructures, which gather the waste heat given off by such an object through orbiting photovoltaic systems to provide energy for their environment. Examples of this are the Provius Jupiter Brain and the Abyx River Jupiter Brain.