M-Brain, Moon Brain
Moon Brain
Image from Steve Bowers
A typical moon brain orbiting a Jovian class planet
An archailect based upon a computational substrate comparable in mass and size to a small moon or rocky core of a planet, typically in the 1X1021 kilogram range. The computronium basis usually corresponds to a highly ordered metastable material structure, with diamondoid or feroid being the most common.

The first S:3 level transapients were housed inside moon-brains of around a thousand kilometres in diameter. In more recent eras, S:3 transapients which run on substrates designed by higher-level archailects are generally much smaller.

Image from Steve Bowers
If a moon-brain is fully active, its processors can emit a very significant amount of waste heat; this example has extended numerous cooling loops to increase its surface area and allow heat to be radiated away more efficiently.

Some moonbrains are very difficult to detect as such, since they operate at low power and emit little heat. These are generally transapient entities that are largely inactive for unknown reasons. The class of transapient known as Slow Gods are typical of this sort of entity.
Moon Brain
Image from Steve Bowers
A moderate sized, largely inactive moonbrain orbiting a cryojovian world
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Development Notes
Text by Adam Getchell
Initially published on 21 August 2005.

Additional Information
White Paper dealing with the physics of Intelligent Super-Objects;
The Physics of Information Processing Superobjects: Daily Life among the Jupiter Brains