42000s

The 42000s is a designation for the decade spanning 42000 through 42009 in calendars that use the suffix -s to indicate decades. It is a far-future interval, about 40,000 years ahead of the present, and occurs mainly in speculative fiction and theoretical timelines rather than real-world forecasting.

In fiction and worldbuilding, the 42000s serves as a setting for discussions of interstellar travel, planetary colonization, advanced AI, bioengineering, modular megastructures, and post-scarcity societies. Writers use this horizon to explore long-term consequences of current trends, such as climate engineering, resource management, and governance across distributed human and non-human networks, without implying a single canonical future.

For chronology, predictions about the 42000s depend on assumed rates of technological progress, societal change, and astronomical events. Because it lies far beyond validated extrapolation, the term mainly helps to frame hypothetical narratives rather than to provide empirical forecasts. Notation-wise, some readers may encounter alternative forms of the label, but 42000s remains a common convention for that distant decade.