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It's kinda surreal from a Non American Point of view seeing congress beginning to be serious about building a moon base
ISS feels like a ticking time bomb with leaks and old hardware. It's a big failure of NASA leadership to not advance the replacements sooner. I'm also sure that Boeing keeps lobbying for ISS extensions to keep their $1 billion a year to fly it.
With no funding mind you. We don't pay you to get it done. We just tell you to get it done.
Maybe this is a stupid question, but why does discussion of the ISS's age always end up as an all-or-nothing debate? It's modular so can't we treat it like a Ship of Theseus and replace the modules one at a time?
There is a ton of external wiring and plumbing connecting modules, so it isn't as easy as undocking one. Think about all the power and cooling connections that have to route to the truss, plus all the data lines between modules. The US segment and Russian segment are inextricably linked with all those external connections, and potentially even cold welded together at the mechanical interface.
The maintenance is piling up on old parts. One of the selling points of new stations is to dramatically reduce the part count. Imagine stocking dozens of types of fans, fasteners, pipe fittings, connectors, etc for a bunch of different heritage modules.
Companies building new stations don't want the old stuff. NASA asked them. Even cargo modules, like Leonardo, which is basically a can, aren't desirable. At some point (idk if this is still true) Axiom was going to get the Raffaello cargo module out of storage on the ground to convert and reuse it, but that's all I'm aware of.
Thanks, that makes sense
There is a ton of external wiring and plumbing connecting modules, so it isn't as easy as undocking one. Think about all the power and cooling connections that have to route to the truss, plus all the data lines between modules. The US segment and Russian segment are inextricably linked with all those external connections, and potentially even cold welded together at the mechanical interface.
So was the purpose of the modularity only to allow for it to be built piecemeal or is this congealing of the modules due to one-off repairs that accrued over time?
I remember seeing a concept for a Boeing space station that used inflatable modules and I thought at the time it seemed kinda like a evolution of the ISS's modular concept. But your explanation make me wonder if a modular space station even makes sense (outside of the initial building phase)
They used the biggest modules they could fit in a Shuttle. Or fit in a rocket fairing if they could fly themselves. That meant being stuck with 4.5m wide cans. The old Salyut stations were single modules, then MIR was a big modular one to get more space, crew, power, equipment, etc, and ISS is the evolution of that idea.
Skylab was a huge volume because they used a Saturn upper stage. Some new stations will have bigger single modules, like Orbital Reef and Voyager, because of the bigger fairing sizes on Starship and New Glenn. Inflatables are a little annoying to build out inside and they still need some dev work, so a lot of the next gen stations are big cans that might have some inflatable modules on the sides.
Moon base. No healthcare.
this post was submitted on 05 Mar 2026
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