Limits of computation

hypothesis that reality could be a computer simulation

physical principle that erasing one bit of information at temperature 𝑇 requires energy 𝑘𝑇ln(2)

Upper limit on entropy that can be contained within a given finite region of space which has a finite amount of energy, in physics.

highest possible rate of computation in this universe

problem whose solution requires a computer at least the size of the Earth and a time period at least the estimated age of the Earth to be computed

physical and practical limits to the amount of computation or data storage with a given amount of mass, volume, or energy