Nations with Most Long-Duration Astronauts

Russia (including the former Soviet Union) has consistently led in long-duration spaceflights, largely due to its Salyut and Mir space station programs, followed by the United States with missions on Skylab and the International Space Station.

Sources

• ESA human spaceflight statistics - European Space Agency
• NASA astronaut Mark Vande Hei breaks record for longest US spaceflight | Space
• Timeline of longest spaceflights - Wikipedia
• nasa.gov

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