Winged Ythrians do not need cities.
Zacharian dwellings are far apart but linked by aircars and telecommunications.
The entire Earth is connected in this way in the later period of the Psychotechnic History. See here.
This looks like a fairly consistent prophecy. What Ishtarians and Ythrians can do physiologically, human beings, assuming that we survive, will do technologically: maintain close social contacts across vast physical distances.
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However, light speed will limit how far that can be extended.
The roughly 1.3 second travel time for light between earth & moon will be only a minor annoyance for conversation with someone on a moonbase.
The several light minute to several light hour distances between planets will mean that communication will be with something like emails, sometimes with audio, picture, or video attachments.
Settlement in the Kuiper Belt & Oort Cloud will exten such delays to days, months, years.
Interstellar communication links of course will involve delays of many years
Of course physical travel will take far longer than communication.
I am assuming no FTL of course.
Kaor, Paul and Jim!
Paul: I think humans are so configured, psychologically, that most will prefer to live in hamlets, villages, towns, cities.
Jim: Not all scientists totally dismiss FTL as an impossibility. E.G., see the Alcubierre FTL theory.
Ad astra! Sean
I can dismiss something as very unlikely without thinking it totally impossible.
I regard the wormhole link as less implausible than any other sort of FTL that has been proposed.
At least some varieties of that allow connections across spacetime with limitations that prevent "Closed Timelike Curves" Ie: going back in time.
In these two posts the comentary gets into discussion about the General Relativity of Wormholes from someone with the necessary physics background to say what works in terms of GR.
http://www.rocketpunk-manifesto.com/2010/02/on-torchships.html
http://www.rocketpunk-manifesto.com/2010/03/rapid-transit.html
Kaor, Jim!
And it's my STRONG hope and desire that a real FTL drive is invented!
ad astra! Sean
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