Boltzmann Brain
A theoretical concept in cosmology and statistical mechanics referring to a hypothetical brain or conscious mind spontaneously arising in outer space from random quantum fluctuations in a high-entropy universe. Named after physicist Ludwig Boltzmann, the concept arises from the idea that, given an infinite and/or sufficiently old universe, highly structured brains would randomly form out of chaos due to statistical probabilities. Such brains would occur only momentarily but, while extant, would contain within themselves the spectral memories, emotions, and dreams endemic to human consciousness. According to current calculations, Boltzmann brains are statistically almost infinitely more probable than a universe with complex, evolving life - meaning that, in all likelihood, we are, at this very moment, merely an instantaneous mental figment in a vast, unrelenting void.