Expanding, And Eventually Replacing, The International Space Station:
Aboard the International Space Station (ISS), humanity has managed to maintain an uninterrupted foothold in low Earth orbit for just shy of 20 years. There are people reading these words who have had the ISS orbiting overhead for their entire lives, the first generation born into a truly spacefaring civilization.
But as the saying goes, what goes up must eventually come down. The ISS is at too low of an altitude to remain in orbit indefinitely, and core modules of the structure are already operating years beyond their original design lifetimes. As difficult a decision as it might be for the countries involved, in the not too distant future the $150 billion orbiting outpost will have to be abandoned.
Naturally there's some debate as to how far off that day is. NASA officially plans to support the Station until at least 2024, and an extension to 2028 or 2030 is considered very likely. Political tensions have made it difficult to get a similar commitment out of the Russian space agency, Roscosmos, but its expected they'll continue crewing and maintaining their segment as long as NASA does the same. Afterwards, it's possible Roscosmos will attempt to salvage some of their modules from the ISS so they can be used on a future station.
(Score: 2) by Phoenix666 on Wednesday March 04 2020, @04:00PM (2 children)
That is my stock in trade. But caulking around an existing window when bringing up new material from planetside costs $10,000/lb makes a compelling argument.
The Soviet Union maintained a continuous presence in orbit for a fraction of what it cost the Americans, because they went with what works instead of what consultants dictated. A similar approach to parsimony would seem to tell in a world in which efficiency rules.
Washington DC delenda est.
(Score: 2) by PiMuNu on Wednesday March 04 2020, @04:13PM
I can only speak from experience - once vacuum seals have been "caulked" a few times, one gets to a system that is more sealant than metal... at some point it is expedient to build new.
My experience comes from vacuum seals in particle accelerators, so different regime...
(Score: 2) by DannyB on Wednesday March 04 2020, @05:34PM
Your last paragraph almost sounds like you might be thinking of SpaceX.
People today are educated enough to repeat what they are taught but not to question what they are taught.