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While it took about 10 years and 30 missions to assemble the ISS, and its end of life is about mid to end of 2020's, is there any plan to plan for a new ISS?

Otherwise, the time window might become too short for delivering a new ISS1? Or is there just no need anymore for such a thing if other projects will work well like Moon gateway, Moon base, Mars missions?

1 possibly, some years from now, building an ISS might take less time and less missions due to new technologies like 3D printing and advanced transportation, nevertheless there is a planning effort and possibly also the specifications might become more demanding.

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    $\begingroup$ ISS is currently an enormous money hog; cost of maintaining it is one of primary roadblocks in exploration of the Moon and Mars. Many people want it gone with no replacement, for no other reason than freeing up the budget for other missions. Simultaneously, Russians aren't interested in ditching it and consider detaching the Russian segment and running it as a standalone station in case ISS is to be deorbited. $\endgroup$ – SF. Nov 27 '19 at 14:58
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    $\begingroup$ The Russian stance is a serious political/PR problem. The Russian segments are the oldest of all, and if they remain space-worthy, it would suggest either the Western segments were deorbited prematurely (not used to their full extent, some of expense of building them and putting them in space wasted) or they were built inferior to Russian, less durable, worse. It's still just the same silly posturing and flexing as in the Cold War (the Shuttle being such a money sink, kept for political reasons) but it seems ISS may remain in orbit until Russians decide it's EOL time for their segments too. $\endgroup$ – SF. Nov 27 '19 at 15:14
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    $\begingroup$ ...so, in short, current plans are, yes, there will be no ISS in 2030s. But as history and current political climate suggest, the current plans are unlikely to survive. $\endgroup$ – SF. Nov 27 '19 at 15:22
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    $\begingroup$ Let's add Dragon 2 is almost ready to fly, and some serious funds were put in it. Removing its only destination and purpose of existence would make funding it very questionable. $\endgroup$ – SF. Nov 27 '19 at 15:29
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    $\begingroup$ Some parts of the ISS are 20 years old and critical to the stations functioning. It's old. Technology has gotten a lot better since the first components were launched. Also, Starship will be able to provide the entire pressurized volume of the ISS in a single launch. Even if starship is delayed by 5 years, that's still before 2030. $\endgroup$ – Dragongeek Nov 28 '19 at 0:53

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