NASA plans to deorbit the ISS sometime around 2030. Building something the size of the ISS in orbit is a huge undertaking and NASA keeps talking about wanting to build new space stations or a moon base, so why not leave the ISS in space and reuse it rather than literally throw the whole thing away?
In: Planetary Science
Because it’s not worth keeping. A lot of things are more expensive to update&repair than it is to construct something new and better from scratch.
The ISS is one of those things. Most of ISS modules are over 15 years old and have done what they can do.
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