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What do you do with a giant space station when its lifespan is over?
The article notes that no date has been set for deorbit, and that it likely will not happen before 2028. The article also includes information about some of medical and engineering problems of long term weightlessness that have been discovered on ISS, and how engineers have attempted to address them.
Unfortunately, some of these problems, such as the recently discovered vision problems, remain unsolved. It is a shame that while Russia wants to do multi-year missions on the station to study these issues, NASA continues to resist.