Photos: Space Station's Expedition 33 Mission

Space Triathlon Runner Sunita Williams

NASA astronaut Sunita Williams completed a triathlon from space Sept. 16, 2012, using an orbital treadmill to complete the running portion, a stationary bicycle for the biking leg, and a resistance machine to simulate swimming.

NASA astronaut Sunita Williams (front left) takes command of the International Space Station from cosmonaut Gennady Padalka (front right) during a ceremony marking the start of the Expedition 33 increment aboard the space station on Sept. 15, 2012.

NASA astronaut Sunita Williams, Expedition 32 flight engineer and commander of the International Space Station's Expedition 33 crew, poses for a photo with her spacesuit ahead of an Aug. 30, 2012, spacewalk.

The International Space Station's Expedition 33 crew. From left: NASA astronaut Sunita Williams, Russian cosmonaut Yuri Malenchenko, Japannese astronaut Akihiko Hoshide, Russian cosmonauts Evgeny Tarelkin and Oleg Novitskiy and NASA astronaut Kevin Ford.

The Expedition 33 patch depicts the International Space Station (ISS) orbiting around the Earth, and into the future. Image released December 2011.

The Soyuz TMA-05M rocket launches from the Baikonur Cosmodrome in Kazakhstan on July 15, 2012. Crewmembers for Expeditions 32 & 33 were flying to the International Space Station.

The Soyuz TMA-05M rocket launches from the Baikonur Cosmodrome in Kazakhstan on July 15, 2012.

Expedition 32/33 crew members leave building 254 following their suited up for launch July 15, 2012 at the Baikonur Cosmodrome in Kazakhstan.

The grid structure at the upper side of each Aquatic Habitat, an aquarium for the International Space Station, captures air in each grid, while preventing water from escaping. Air will be injected with special syringe by the crew prior to the start of an investigation in 2012.

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Photos: Space Station's Expedition 33 Mission