At any of these space stations, NASA will be the “anchor tenant,” Mastracchio says. But as the commercial space travel market grows, the station will host other visitors, which could include those coming for tourism, sports, entertainment, and advertising. In fact, how the ISS’s successor takes shape and which additional modules get prioritized for development could depend on market forces. In practice, that could initially create competition for the limited space available: Astronauts from the US, Europe, Russia, Japan, and Canada could end up vying for legroom and space for their research-focused experiments while private customers do the same for their activities.
But as the station is built up over
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