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NASA Astronaut Tracy C. Dyson

Tracy C. Dyson was selected as a NASA astronaut in 1998. Most recently, Dyson launched to the International Space Station on March 23, 2024, as a flight engineer on the Soyuz MS-25 spacecraft. Dyson spent six months aboard the station as an Expedition 71 flight engineer, conducting science experiments and maintaining the space station. It was her second long-duration spaceflight and third mission overall.

Quick Facts

In 1999, she was first assigned to the Astronaut Office International Space Station Operations branch as a Russian crusader, participating in the testing and integration of Russian hardware and software products developed for the International Space Station (ISS).

In 1999, she was first assigned to the Astronaut Office International Space Station Operations branch as a Russian crusader, participating in the testing and integration of Russian hardware and software products developed for the International Space Station (ISS).

In 2007, Caldwell Dyson flew aboard the Space Shuttle Endeavor on STS-118, where she served as a Mission Specialist. In 2010, she served as Flight Engineer for Expedition 23/24. She has logged more than 373 days in space, including over 23 hours in four spacewalks.

In 2007, Caldwell Dyson flew aboard the Space Shuttle Endeavor on STS-118, where she served as a Mission Specialist. In 2010, she served as Flight Engineer for Expedition 23/24. She has logged more than 373 days in space, including over 23 hours in four spacewalks.

Dr. Caldwell Dyson has designed, constructed and implemented electronics and hardware associated with the study of atmospheric gas phase chemistry, and has developed and presented numerous papers on methods of chemical ionization for the spectral interpretation of trace compounds.

Dr. Caldwell Dyson has designed, constructed and implemented electronics and hardware associated with the study of atmospheric gas phase chemistry, and has developed and presented numerous papers on methods of chemical ionization for the spectral interpretation of trace compounds.

(11 September 2010) NASA astronaut Tracy Caldwell Dyson, Expedition 24 flight engineer, looks through a window in the Cupola of the International Space Station. A blue and white part of Earth and the blackness of space are visible through the windows. The image was a self-portrait using natural light.

NASA astronaut Tracy Caldwell Dyson pauses for a portrait while donning her spacesuit and going under water in the Neutral Buoyancy Lab, Monday, July 8, 2019 at NASA’s Johnson Space Center in Houston, Texas. (Credit: NASA/Bill Ingalls)

(7 April 2010) Four women on the International Space Station pose for a photo in the Zvezda Service Module while space shuttle Discovery remains docked with the station. From the left are NASA astronaut Dorothy Metcalf-Lindenburger and Japan Aerospace Exploration Agency (JAXA) astronaut Naoko Yamazaki, both STS-131 mission specialists; along with NASA astronauts Tracy Caldwell Dyson, Expedition 23 flight engineer; and Stephanie Wilson, STS-131 mission specialist.

(7 August 2010) Attired in her Extravehicular Mobility Unit (EMU) spacesuit, NASA astronaut Tracy Caldwell Dyson, Expedition 24 flight engineer, prepares to exit the Quest airlock of the International Space Station to begin the first of three planned spacewalks to remove and replace an ammonia pump module that failed July 31.

(28 October 2009) Astronaut Tracy Caldwell, Expedition 23/24 flight engineer, gets help in the donning of a training version of her Extravehicular Mobility Unit (EMU) spacesuit in preparation for a spacewalk training session in the waters of the Neutral Buoyancy Laboratory (NBL) near NASA’s Johnson Space Center.

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Tracy C. Dyson

Learn more about astronaut Tracy C. Dyson, including her flight experience, hobbies, education, background and more.

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Attired in a training version of her shuttle launch and entry suit, astronaut Tracy E. Caldwell, STS-118 mission specialist, participates in a training session on the usage of a special device, used to lower oneself from a troubled shuttle, in the Space Vehicle Mockup Facility at the Johnson Space Center.

(4 October 2006) Attired in a training version of her shuttle launch and entry suit, astronaut Tracy E. Caldwell, STS-118 mission specialist, participates in a training session on the usage of a special device, used to lower oneself from a troubled shuttle, in the Space Vehicle Mockup Facility at the Johnson Space Center.

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