"Perpetual motion devices are impossible.
Note that the modern definition of perpetual motion devices refers to systems that produces energy without changing their state, not something that mantains it's speed or rotation indefinetly. Every atom or particle would be such a device, by that definition!
Why they are impossible? Because they violates thermodynamics' principles."
The thermodynamics' principles are an approximate mathematical model, for instance they are for isolated systems and we live in an open system.
They are not valid in a closed system.
Can you stop the planets? Can you stop the atoms?
Perpetual motion is possible. With thermodynamics' principles, someone wants to build a jail for your mind.
