Stop It! Perpetuum Mobile

@Edgehead1132 actually without outside force the solar system would keep moving since there isnt any friction in space. Also in the literal terms of perpetual motion is possible, this is to say something that is continually moving because it does not break any physical laws such as newton's law of motion or the laws of thermal dynamics. how ever a system that produce more energy then it is put in is not possible(if anyone has ever made it is simply converting one form of energy into another).

but they revolve around the sun's gravitational pull, which will change drastically when the sun dies, not sure what will happen then, it's kinda hard to tell

@Edgehead1132 actually when the sun dies it will become a planet and gravitational force depends on mass of the object so not counting the sun collapsing in on itself and turning into a white dwarf or a black hole it wouldnt change the gravitational force from the sun. but i digress from my previous point. without outside force a moving mass will continue to move thus the literal term of perpetual motion(something that is perpetually moving) is possible.

Unfortunately, there's this annoying little thing called gravity...it sort of tends to act on all objects with mass.

@hlpbgh and your point is?

Well, in your comments you said "without outside forces," so I was wondering if you acknowledged the existence of gravity or not. Since everything experiences gravity's attractive force, it is inevitable objects will collide with something else eventually, and then friction takes its toll. They ricochet, and repeat. Eventually, all energy is lost. It'll just take a few billion years.

@hlpbgh oh i see what your saying. well if your object is in orbit around something then you dont have to worry about gravity because gravity is used for angular acceleration of the object. basically the force needed to make something turn from a straight path. So if your object is in a perfect orbit(the force required to curve the object path is equal to the force of the gravity from second object) then theres no reason why the two object would collide with each other.

Yes, if only those two bodies existed in the universe. However, since more than two orbiting bodies exist, other non-centripetal gravitational forces are experienced by both bodies, hence their orbits will eventually decay. Ideal Scenario vs. Reality.

@hlpbgh Well i did say without outside force and gravity from other objects are outside force.. but yeah if there was outside forces then the orbit would decay. its not really ideal scenario vs reality, because in a reality an ideal scenario can happen. its more like theory vs real world.

the law of conservation of energy is broken all of the type, but only at the subatomic level..