you are viewing a single comment's thread
view the rest of the comments
[–] 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.

  • source
  • parent
  • hideshow 7 child comments
  • [–] 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.

  • source
  • parent
  • hideshow 6 child comments
  • [–] 1 point 4 months ago (5 children)

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

  • source
  • parent
  • hideshow 5 child comments
  • [–] 2 points 4 months ago (4 children)

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

  • source
  • parent
  • hideshow 4 child comments
  • [–] 1 point 4 months ago (3 children)

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

  • source
  • parent
  • hideshow 3 child comments
  • [–] 0 points 4 months ago (2 children)

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

  • source
  • parent
  • hideshow 2 child comments