Ixion
An illustration of the Ixion module, an upper stage left in orbit and refitted as a space station module, being attached to the ISS.

A five-month study supported by NASA has concluded that it is technically feasible to convert a launch vehicle upper stage into a habitat module that could be used on the International Space Station or future commercial space station.

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Jeff Foust has more than a decade of experience writing about space policy, entrepreneurial ventures and regulatory affairs. In 2001, he established spacetoday.net to aggregate and summarize the day's space-related news stories. In 2003, he started The...