On Year 3999

It is the last year representable in Roman numerals and is represented as MMMCMXCIX. By this time, it is possible that human civilization would reach Type 1 on the Kardashev scale, which is a measure of the amount of energy a civilization uses. Type 1 civilizations use all the energy of their planet, Type 2 civilizations use all the energy of their star, and Type 3 civilizations use all the energy of their galaxy. It is also possible that superintelligent AI and microscopic bots could evolve, along with the significant extension of the human lifespan.

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