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{{Short description|South Korean astronaut (born 1978)}}
{{Hatnote|Yi So-yeon (Hangul: ''이소연'') is also romanized as Lee So-yeon. For other persons of the same name, see Lee So-yeon}}
{{Use mdy dates|date=April 2018}}
{{Infobox astronaut
| name = Yi So-yeon
| native_name = {{nobold|이소연}}
| image = Yi So-yeon (NASA - JSC2008-E-004174).jpg <!--Please do not use Commons:Image: Korean astronaut-Yi Soyeon-02.jpg due to suspected copyright problems. See Commons:Image talk:Korean astronaut-Yi Soyeon-02.jpg. Thanks.-->
| type = KAP astronaut
| nationality = South Korean
| birth_date = {{Birth date and age|1978|06|02}}
| birth_place = Gwangju, South Korea
| occupation = Researcher
| rank =
| selection = 2006 South Korean program
| time = 10 d 21 h
| mission = Soyuz TMA-12/Soyuz TMA-11
| insignia = 
|website=https://instagram.com/astro_yisoyeon}}
{{Infobox Korean name
| title = Korean name
| hangul = 이소연
| hanja = 李素妍
| rr = I So-yeon
| mr = Yi Soyŏn
| text = {{IPA-ko|i so.jʌn|IPA}}
| tablewidth = 231
| color = #ffdead
}}
'''Yi So-yeon''' (born June 2, 1978) is a South Korean astronaut and biotechnologist who became the first Korean to fly in space.

Lee was born and raised in Gwangju, South Korea and graduated from KAIST with a Master's degree in Mechanical Engineering. In 2006, she was selected as one of two finalists in the Korean Astronaut Program: a mission to send the first Koreans to space. A year later, it was announced that she was to be the backup. However, on March 10, 2008, it was announced that she would be the primary. On April 8, 2008, she was launched into space alongside two Russian cosmonauts. She spent around eleven days in space; on April 19, she returned to the surface.

Afterwards, Yi worked as a researcher at the Korea Aerospace Research Institute (KARI). She then attended the International Space University before resigning from KARI to pursue an MBA at the [[University of California, Berkeley]] Haas School of Business. She then moved to Washington and lectured at Everett Community College and the University of Washington.

==Biography==
Yi So-yeon was born to father Yi Gil-soo and mother Jeong Geum-soon, and raised in Gwangju, South Korea.

Yi studied at Gwangju Science High School. She earned bachelor's and master's degrees with a focus on mechanics at KAIST in Daejeon. Her doctorate in biotech systems was conferred on February 29, 2008 in a ceremony at KAIST although she was unable to be present due to her training commitments in Russia. In 2010, she enrolled in the MBA program at the Haas School of Business at the [[University of California, Berkeley]] In 2015 she taught at Everett Community College in Washington State as an Engineering Physics Professor.

==Space career==

===Korean astronaut program===
{{main article|Korean Astronaut Program}}
[[Image:Korean astronauts-Space station training-01.jpg|thumb|right|Yi So-yeon and Ko San participate in a space station hardware training session in the Space Vehicle Mockup Facility at the Johnson Space Center by Crew Systems instructor Glenn Johnson.|alt=Yi So-yeon and Ko San participate in a space station hardware training session in the Space Vehicle Mockup Facility at the Johnson Space Center by Crew Systems instructor Glenn Johnson.]]

Yi was one of the two finalists chosen on December 25, 2006 through the Korean Astronaut Program. On September 5, 2007, the Korean Ministry of Science and Technology selected Ko San as the primary astronaut, and Yi So-yeon as backup, following performance and other tests during their training in Russia.

A change was made on March 7, 2008, when Yi was selected to train with the primary crew, and confirmed on March 10 the Ministry of Education, Science and Technology announced that Yi would replace Ko. This was after the Russian Federal Space Agency asked for a replacement, because Ko violated regulations several times at a Russian training center by removing sensitive reading materials and mailing one back to Korea. On April 8, 2008, Yi was launched into space on board Soyuz TMA-12 with two Russian cosmonauts. South Korea is reported to have paid Russia $20{{nbsp}}million for Yi's space flight. She is the third woman, after Helen Sharman of the United Kingdom and [[Anousheh Ansari]] an Iranian American, to be the first national from their country in space.

====Terminology====
Flying as a guest of the Russian government through a commercial agreement with South Korea, Yi's role aboard Soyuz and the ISS is referred to as a spaceflight participant ''({{lang-ru|uchastnik kosmicheskovo poleta}})'' in Russian Federal Space Agency and NASA documents and press briefings.

===Mission===
During her mission, Yi So-yeon carried out eighteen&nbsp;science experiments for KARI and conducted interviews and discussions with media. In particular, she took with her 1,000&nbsp;fruit flies in a special air-conditioned container box (Konkuk University experiment). She monitored the way the changes in gravity and other environmental conditions alter the behaviour of the flies, or their genome. Other experiments involved the growth of plants in space, the study of the behaviour of her heart, and the effects of gravity change on the pressure in her eye and shape of her face. With a specially designed three-dimensional Samsung camera, Yi took six shots of her face every day to see how it swells in the different gravity. She also observed the Earth, and in particular the movement of dust storms from China to Korea. She also measured the noise levels on board the ISS.

[[Image:Yi+Malenchenko+Whitson at ISS 08Apr17 (NASA-ISS016-E-036365).jpg|thumb|right|300px|Yi So-yeon with NASA astronaut Peggy Whitson (right), Expedition 16 commander, and Russian Federal Space Agency cosmonaut Yuri Malenchenko (middle), flight engineer, at the International Space Station.|alt=Yi So-yeon with NASA astronaut Peggy Whitson (right), Expedition 16 commander, and Russian Federal Space Agency cosmonaut Yuri Malenchenko (middle), flight engineer, at the International Space Station.]]
South Korean scientists created a special low-calorie and vitamin-rich version of kimchi for Yi.

===Return flight===
At the end of the mission, Yi returned to Earth along with ISS crew members Peggy Whitson and Yuri Malenchenko aboard Soyuz TMA-11, on April 19, 2008. Due to a malfunction with the Soyuz vehicle, the craft followed a ballistic re-entry which subjects the crew to severe gravitational forces up to 10 times the amount experienced on Earth. As a result of the re-entry, the TMA-11 craft used in the return flight landed {{convert|260|mi|km}} off-course from its target in Kazakhstan. All three survived, although requiring observation by medical personnel.

Yi was hospitalized after her return to Korea due to severe back pains. Though many believed these pains were the result of the rough landing, they were in fact normal and expected. They were the result of spinal re-compression.

===Post-flight===
After her flight, Yi worked as a researcher at KARI and as Korea's space ambassador with Ko San. She will receive income from future TV commercials. On October 4, 2008, Yi launched the International Institute of Space Commerce at a ceremony held in Douglas, Isle of Man.

In 2009, Yi became the first astronaut to attend the International Space University (ISU) Space Studies Program (SSP) at NASA Ames Research Center, held in conjunction with the inaugural class of the Singularity University (SU) Graduate Studies Program (GSP).

Based on her track record so early on in her career, Yi was listed as one of the Fifteen Asian Scientists To Watch by Asian Scientist Magazine in May 2011.

== Career after flight ==
On August 13, 2014, the Korean Aerospace Research Institute announced that Yi had resigned for personal reasons, ending the South Korean space program. In the interview, she gave an explanation as to why she resigned from the program, she wished to resign for personal reasons in order to study for an MBA.

After receiving her MBA at the [[University of California, Berkeley]] Haas School of Business, Yi joined the Association of Spaceflight Professionals. She has since lived in Washington, [[United States]]. Beginning in 2016, she taught physics at the Everett Community College in Washington, [[United States]]. She has also lectured at the University of Washington.

==See also==
* Timeline of space travel by nationality
* ARISS (Amateur Radio on the International Space Station)

==External links==
{{commons category|Yi So-yeon}}
*[http://www.spacefacts.de/bios/international/english/lee_so-hyun.htm ''Spacefacts'' biography of Yi So-yeon]
*[http://www.seoulglow.com/ A series of interviews with Seoul Glow]
*[https://digitalcollections.museumofflight.org/items/show/45851 Yi So-yeon oral history interview] at The Museum of Flight Digital Collections
*[http://www.spacefacts.de/bios/international/english/lee_so-hyun.htm Spacefacts bio] April 2018
*{{instagram|astro_yisoyeon}}

{{South Korean Space Program}}

{{DEFAULTSORT:Yi, So-Yeon}}

hu:Yi So-yeon