The science of thermodynamics studies three main systems of thermal agitation: (1) isolated system, (2) closed system, and (3) open system. As experimentally verified, all these agreed that perpetual motion (PM) is impossible. PM describes a theoretical mechanical agitation that does not dissipate energy or heat and after the initial input energy, does not need anymore energy to keep it going.
For an isolated system, neither energy nor mass crosses the control volume, internally or externally. Therefore, an isolated system is equivalent to a PM. Where and when an isolated system begins to give up or to take in energy across the control volume but at no change in mass then and there it becomes a closed system. Where and when a closed system also begins to lose or gain mass across the control volume there and then it becomes an open system.
From these, it can be conjectured that some systems of agitation can last forever, some can last a long time, and some can last only a short time. The entire universe seems to belong to the first kind. Stable elementary particles seem to belong to the second kind. If a hundred years is a short time then human beings belong to the third kind.


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