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[–] 20 points 4 months ago (8 children)

Perpetual motion is everywhere in space. Using that motion for doing work will always change the motion, and it will eventually no longer be useful. This is what a perpetual motion machine tries to do but can not.

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  • [–] 9 points 4 months ago (7 children)

    AFAIK even space will cool down and stop eventually. So not perpetual motion very low friction motion? I know that expansion also plays a role.

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  • [–] 0 points 4 months ago (6 children)

    If you think about it, when the universe cools down, maybe some rocks will fly forever without hitting anything.

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  • [–] 1 point 4 months ago (5 children)

    A cooled down universe does not move at all AFAIK. please Look up Brownian motion.

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  • [–] 2 points 4 months ago (4 children)

    If a rock is moving between galaxies, what would make it stop?

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  • [–] 1 point 4 months ago (3 children)

    Does a given mass ever get outside the influence of both galaxy's gravity influences?

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  • [–] 0 points 4 months ago (2 children)

    Why not? When two galaxies collide some rocks can get enough speed to escape.

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