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Peggy Whitson

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Peggy Annette Whitson is a prominent American astronaut and biochemistry researcher.

She has spent a total of 695 days in space. This is a record for any American or any woman. Whitson has also held several leadership roles within NASA. She served as the 13th Chief of the Astronaut Office. This is the most senior position in the NASA Astronaut Corps. Currently, she works as a consultant and leader for Axiom Space.

Jsc2009e146742
Jsc2009e146742

Whitson's career involved complex scientific research and station management. During her first mission, Expedition 5 in 2002, she served as a science officer. She conducted 21 investigations in human life sciences and microgravity sciences. Microgravity refers to the condition of weightlessness in space. She also installed the Mobile Base System and various truss segments. These parts are essential structures for the International Space Station (ISS). She used the station's remote manipulator system to complete these tasks.

ISS-05 Peggy Whitson works near the Microgravity Science Glovebox
ISS-05 Peggy Whitson works near the Microgravity Science Glovebox

Whitson's missions included several historic leadership milestones. In 2007, during Expedition 16, she became the first woman to command the ISS. In 2017, she became the first woman to command the station twice. She also became the first woman to serve as NASA's Chief Astronaut in 2009. This role was significant because she was the first non-pilot to hold it. Her leadership helped manage the operations of the entire Astronaut Corps. She held this position until she returned to active flight status in 2012.

Soyuz TMA-11 Patch
Soyuz TMA-11 Patch

Space exploration requires performing Extravehicular Activities, or EVAs. An EVA is a spacewalk where an astronaut exits a spacecraft.

Expedition 5 EVA
Expedition 5 EVA

Whitson has performed 10 total EVAs throughout her career. Her cumulative EVA time is 60 hours and 21 minutes. This places her in seventh place for total EVA time. She also holds the record for the oldest woman spacewalker. These walks are vital for maintaining the ISS. Whitson used them to install shielding and replace electrical components.

ISS-50 EVA-1 (e) Peggy Whitson
ISS-50 EVA-1 (e) Peggy Whitson

Whitson's journey began with a childhood interest in space. She grew up on a farm near Beaconsfield, Iowa. Her parents, Keith and Beth, were farmers. In 1969, she watched the first Moon landing on television. This event inspired her to pursue a career in science. She earned a Bachelor of Science in biology and chemistry in 1981. Later, she earned a doctorate in biochemistry from Rice University in 1986.

NEEMO5
NEEMO5

Her academic background prepared her for her work as a research biochemist.

Her later missions demonstrated incredible endurance. During Expedition 50, 51, and 52, she stayed in space for 289 days. This was her longest single space flight. At age 56, she was the oldest woman ever in space at that time. She also broke the record for the most cumulative time in space by a NASA astronaut. This achievement earned her a televised phone call from the White House. In 2025, at age 65, she set a record as the oldest woman to orbit the Earth.

ISS-50 Peggy Whitson and Thomas Pesquet inside the BEAM
ISS-50 Peggy Whitson and Thomas Pesquet inside the BEAM

Whitson continues to contribute to human spaceflight through Axiom Space. She served as the commander for Axiom Mission 2 in 2023. She also commanded Axiom Mission 4 in 2025. Her work helps bridge the gap between NASA and commercial spaceflight. She currently serves as the Vice President of Human Space Flight for Axiom. Her career connects biochemistry, engineering, and leadership. She remains a central figure in the exploration of the cosmos.

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STS-111 Patch.svg
File:Expedition 5 insignia.svg
Expedition 5 insignia.svg
File:STS-113 Patch.svg
STS-113 Patch.svg
File:Soyuz TMA-11 Patch.png
Soyuz TMA-11 Patch.png
File:ISS Expedition 16 Patch.svg
ISS Expedition 16 Patch.svg
File:ISS Expedition 50 Patch.png
ISS Expedition 50 Patch.png
File:ISS Expedition 51 Patch.svg
ISS Expedition 51 Patch.svg
File:ISS Expedition 52 Patch.svg
ISS Expedition 52 Patch.svg
File:NEEMO5.jpg
NEEMO5.jpg
File:Jsc2009e146742.jpg
Jsc2009e146742.jpg
File:ISS-05 Peggy Whitson works near the Microgravity Science Glovebox.jpg
ISS-05 Peggy Whitson works near the...
File:Expedition 5 EVA.jpg
Expedition 5 EVA.jpg

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