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Worldbuilding

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    $\begingroup$ This is going to be a lot harder than just "Build a chain of colonies in the middle of two systems". Over milinea the colonies built between two star systems will drift (2 adjacent star systems are in different orbits around the galactic centre). The drift in relative orbital speed is slow but your colonies are going to be slowly drifting out of position. A line of colonies every light month between 2 stars will not be useful stepping stones after a few thousand years. (After a billion years they'll be scattered around the entire galaxy in a ring) $\endgroup$ Commented Oct 6, 2020 at 9:28
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    $\begingroup$ Is the drift severe enough for that to be relevant considering a timeframe of only a few millenia? If so, it would probably render the whole question moot anyway. $\endgroup$ Commented Oct 6, 2020 at 10:05
  • $\begingroup$ @Ash Why would they drift? Wouldn't they have the same momentum as the starting system? And even if not, couldn't their course be corrected? $\endgroup$ Commented Oct 6, 2020 at 11:15
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    $\begingroup$ @JannPoppinga. Something between solar systems is not free from gravity, it's in a galactic orbit. if they have the same initial speed but different distances from galactic central point they'll have different orbital parameters. $\endgroup$ Commented Oct 6, 2020 at 11:45
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    $\begingroup$ Or put another way. If I put something half way between Earth and Mars at the average velocity of both, I'll have another body in orbit around the sun. A few hours after creation it wont be in the middle of the two bodies anymore. And 9 months later itll be be on the wrong side of the sun. $\endgroup$ Commented Oct 6, 2020 at 11:52