|Mission type||ISS Expedition|
|Space Station||International Space Station|
|Began||11 October 2009|
|Ended||1 December 2009|
|Arrived aboard||Soyuz TMA-15|
Space Shuttle Discovery
|Departed aboard||Soyuz TMA-15|
Space Shuttle Atlantis
|Crew size||6 (to November)|
5 (from November)
Frank De Winne
Robert Brent Thirsk
Nicole P. Stott (to November)
Jeffrey N. Williams
from left to right: Maksim Surayev, Nicole Stott, Jeffrey Williams, Frank De Winne (commander), Robert Thirsk, Roman Romanenko
Expedition 21 was the 21st long-duration mission to the International Space Station (ISS). The expedition began on 11 October 2009, with Frank de Winne becoming the first ESA astronaut to command a space mission.
The handover between Expedition 20 and Expedition 21 required three Soyuz vehicles being docked to the station at the same time, the first time this has occurred.
Soyuz TMA-16 brought the final members of Expedition 21 to the ISS, along with space tourist Guy Laliberté. Laliberté returned to Earth on Soyuz TMA-14 with two members of Expedition 20 on 11 October 2009.
Nicole P. Stott was the last ISS expedition crew member to fly on the Space Shuttle. She returned to Earth aboard STS-129 in November 2009.
(October to November 2009)
(November to December 2009)
|Commander|| Frank De Winne, ESA|
Second and last spaceflight
|Flight Engineer 1|| Roman Romanenko, RSA|
|Flight Engineer 2|| Robert Thirsk, CSA|
Second and last Spaceflight
|Flight Engineer 3|| Jeffrey N. Williams, NASA|
|Flight Engineer 4|| Maksim Surayev, RSA|
|Flight Engineer 5|| Nicole P. Stott, NASA