The space station turned 25 years old on Wednesday (Dec. 6), and NASA is preparing for the pioneering outpost's end.
The agency just celebrated the milestone mission that docked the first two International Space Station (ISS) modules on Dec. 6, 1998. In the runup to that event, NASA updated its private proposal request to help deorbit the station when it retires in 2030 or so. And early stage funding is underway for several commercial replacements that would be run by private companies, with NASA as a customer. The agency wants all these vehicles ready by the time the ISS' work is done.
