• rog@lemmy.one
    link
    fedilink
    arrow-up
    13
    ·
    1 year ago

    Its just a hole though. If you have a tennis racket with no strings and swing it over something stationary the object doesnt move

    • silly goose meekah@lemmy.world
      link
      fedilink
      arrow-up
      16
      ·
      1 year ago

      With the tennis racket analogy both portals would be moving. In the thought experiment from the image just one is moving, resulting in an unaccounted for momentum, unless the people shoot out the blue portal