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The venerable Soyuz and Progress spacecraft, combined with the Soyuz launch system has been in use by the Russian Federation and the Soviet Union for more than 40 years. It's a tested and reliable design and is now what NASA has resorted to using for manned spaceflight and orbital resupply since the Space Shuttle was finally put out to pasture after its final flight last July. The Soyuz can carry up to three astronauts into orbit.
Until other designs shown in this gallery can be thoroughly tested for manned spaceflight, there won't be an American solution to getting our own astronauts into space.
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Vital Specs: Soyuz FG Launch System