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A Matrioshka Brain (or MB) is a hypothetical construction of immense computational and physical resources using a star (usually at its centre) as a power source. It is conjectured but not proven to be physically feasible. It is reasonable to assume that such a construction under currently known laws of physics would be valid.
The term was invented by Robert Bradbury (see external link) as an alternative to Jupiter Brains (their contrast being a concentrated intelligence vs. a distributed intelligence) and is derived from the term for Matryioshka dolls which are analogous to the shells in the most efficient (from an energy and mass requirements perspective) MB construction method known.
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