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.
I know it’s not a “physical collision”. But the gravity “redesigns” both galaxies and some objects can be accelerated beyond the scape velocity of the galaxies combined.
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.
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.
If you think about it, when the universe cools down, maybe some rocks will fly forever without hitting anything.
A cooled down universe does not move at all AFAIK. please Look up Brownian motion.
If a rock is moving between galaxies, what would make it stop?
Does a given mass ever get outside the influence of both galaxy’s gravity influences?
Why not? When two galaxies collide some rocks can get enough speed to escape.
AFAIK galaxies don’t collide, they merge. There is usually no collision due to the massive empty spaces inbetween stars.
I know it’s not a “physical collision”. But the gravity “redesigns” both galaxies and some objects can be accelerated beyond the scape velocity of the galaxies combined.