if perpetual motion is impossible, why/how do planets orbit and spin continually?
In: Physics
According to the delta T equation the earth will stop spinning in 1.9 Trillion years. The planets will not rotate for ever. It will seem that way to us due to our limited observation but they meeting minimal friction in space and they are competing with entropy so eventually everything will collapse again in the heat death of the universe. The amount of mass and inertia they carry mean that it’s going to take either significant mass, force, friction, or a combination of three to have any observable impact. Otherwise it’ll take a lot of time.
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