For the past 20 years, without interruption, a small huddle of people-typically six at a time-have been living and working 250 miles over our heads, circling endlessly through the vacuum of space at five miles per second. Their work is demanding and dangerous, and more specialized, perhaps, than any work has ever been. Nobody else, anywhere, does what they do. To date, 240 people from 19 countries have visited the International Space Station, almost half of them for long-term stays in an outpost with the volume of a six-bedroom house. No one person, no one crew, could convey the space station story in its entirety. But we asked some of the people who've spent the most time there: What's it like?
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