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| ISS Expedition 20/21 | |
|---|---|
| Name | Expedition 20/21 |
| Mission type | Long-duration stay on International Space Station |
| Operator | Roscosmos, NASA |
| Crew size | 3–6 |
| Start date | 2009-05-27 (Expedition 20) |
| End date | 2010-05-25 (Expedition 21 end of overlap) |
| Spacecraft | Soyuz TMA-13, Soyuz TMA-14, Space Shuttle Endeavour (OV-105), other visiting vehicles |
| Launch site | Baikonur Cosmodrome, Kennedy Space Center |
| Insignia | Expedition 20/21 mission patches |
ISS Expedition 20/21
Expeditions 20 and 21 were consecutive long-duration increments aboard the International Space Station during 2009–2010 that included the first time a six-person crew lived and worked continuously in microgravity on the complex. The missions involved international partners including NASA, Roscosmos, European Space Agency, JAXA, and Canadian Space Agency, supporting operations, scientific research, and vehicle traffic related to the Space Shuttle program and ongoing assembly of the station.
Expedition 20 began as a three-person increment transitioning to a six-person multinational crew, and Expedition 21 continued operations with crew rotations and visiting vehicles. Primary objectives included maintaining continuous human presence on the International Space Station, conducting human physiology and microgravity experiments, and preparing the station for additional Module outfitting and logistics. The campaigns supported research programs tied to institutions such as Massachusetts Institute of Technology, European Organization for Nuclear Research, University of Tokyo, Universidade de São Paulo, and National Aeronautics and Space Administration research centers.
The combined expedition crews featured Gennady Padalka (commander), Michael Barratt (flight engineer), Frank De Winne (flight engineer), Roman Romanenko (flight engineer), Maxim Suraev (flight engineer), and Nicole Stott (flight engineer), reflecting partners Roscosmos, NASA, and the European Space Agency. The mission patches followed tradition established by earlier Skylab and Mir flights; insignia elements referenced the International Space Station orbital configuration, national flags of Russia, United States, and Belgium, and symbols associated with continuous human presence pioneered by Expedition 1. Crew patch artwork was produced in coordination with mission planners at Johnson Space Center and mission insignia designers who have worked on Apollo and Space Shuttle programs.
Key mission milestones included the start of Expedition 20 when the previous increment undocked, crew handovers via Soyuz TMA-13 and Soyuz TMA-14, and the arrival and departure of Space Shuttle Endeavour (OV-105) during STS-130. Operational highlights included extravehicular activities coordinated with Mission Control Center (Moscow) and Mission Control Center (Houston), robotics operations using the Canadarm2 delivered and operated by Canadian Space Agency specialists, and science operations scheduled through the Expedition Science Plan managed by NASA and international partners. Flight controllers from Roscosmos Flight Control Center and White Sands Test Facility supported vehicle operations and contingencies.
Research spanned human physiology, combustion, fluid physics, and materials science with experiments from NASA Glenn Research Center, European Space Agency laboratories such as Columbus (ISS module), and JAXA peer programs. Notable investigations included studies on bone loss and muscle atrophy linked to collaborations with Harvard Medical School and Cleveland Clinic, combustion experiments building on work by Stanford University researchers, and crystal growth investigations associated with University of Cambridge. Technology demonstrations included testing of life-support upgrades, communications hardware trials coordinated with European Space Agency engineering teams, and robotics demonstrations using sensors and control software contributed by institutions such as Carnegie Mellon University and MIT Lincoln Laboratory.
Primary crew transport utilized Soyuz TMA-13 and Soyuz TMA-14 for crew rotation and emergency return, while logistics and assembly flights involved Space Shuttle Endeavour (OV-105) on STS-130 delivering the Tranquility (Node 3) and Cupola (ISS module) elements installed to expand habitation and robotics capability. Supply delivery came from visiting vehicles operated by international partners, including automated cargo spacecraft concepts developed by European Space Agency members and resupply planning influenced by agreements with Roscosmos and NASA. Communications relays engaged assets from Tracking and Data Relay Satellite System and ground networks coordinated through European Space Agency ground stations.
During the combined increment, crews performed complex operations such as the installation of the Cupola (ISS module) and outfitting of Tranquility (Node 3), enabling enhanced Earth observation and robotics control. The period included standard contingency responses to orbital debris avoidance maneuvers coordinated with the United States Strategic Command and routine troubleshooting of environmental control systems overseen by teams at Johnson Space Center and TsUP. High-profile visiting vehicle operations like STS-130 captured international attention alongside public outreach events involving institutions such as Smithsonian Institution and American Museum of Natural History.
Expeditions 20 and 21 solidified continuous six-person habitation practices that became standard for later increments, influencing crew scheduling, life-support provisioning, and research cadence managed by NASA and Roscosmos. The installations completed, notably the Cupola (ISS module) and Tranquility (Node 3), remain central to robotics operations by Canadian Space Agency specialists using Canadarm2 and to Earth observation efforts leveraged by NASA Earth Science Division and international research partners such as European Space Agency and JAXA. Operational lessons informed later programs including Commercial Crew Program planning with industry partners like Boeing and SpaceX, and scientific outputs contributed to long-duration human research agendas pursued by institutions like National Institutes of Health and European Research Council.