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Worldbuilding

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    $\begingroup$ Hi Mackenzie, would you mind clarifying what your question is? I see at least two candidates but I'm not sure which one. Also, if your question is purely about blackholes then the first three paragraphs, while nice background, kind of distract from the question you want to ask. $\endgroup$
    – Green
    Commented Dec 21, 2017 at 20:29
  • $\begingroup$ And welcome to Worldbuilding! :) $\endgroup$
    – Green
    Commented Dec 21, 2017 at 20:30
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    $\begingroup$ Two things: intergalactic means they live in more than once galaxy. Interstellar is the word your looking for. Secondly, gravity has no maximum range. The force falls off with the inverse-square law. $\endgroup$
    – Stephan
    Commented Dec 21, 2017 at 23:04
  • $\begingroup$ I'm thinking along the line of Star Trek - Generations where the "nexus" was this giant string flowing through space that could be affected by changes in gravity (e.g., the destruction of a star). Let's reverse the idea and make the string the gravity-bearing object. A super-massive molecular chain bookin' through space and wreaking havoc everywhere it goes. (Maybe a super-dense/massive fluid with high attraction and a parsec long.... Yeah... that's the ticket!) $\endgroup$
    – JBH
    Commented Dec 22, 2017 at 1:21
  • $\begingroup$ @JBH And on the money too. Cosmic strings are hypermassive. Galactic masses per centimetre? (or is it per metre?). Anyway that's exceptionally massive. The main problem may be the way the cosmic string is arranged in space to cause gravitational catastrophe. $\endgroup$
    – a4android
    Commented Dec 22, 2017 at 1:35