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Honoring Black Astronauts During Black History Month 2024


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In honor of Black History Month, we recognize the contributions of Black astronauts to our nation’s space programs. Coming to NASA from a variety of backgrounds as military pilots, engineers, scientists, and physicians, these astronauts have made history-making contributions participating in space shuttle missions to perform critical tasks such as deploying and retrieving satellites, performing spacewalks, conducting science and technology research, and piloting and commanding space shuttle missions. More recently, Black astronauts have played key roles in the assembly of the International Space Station, performing numerous spacewalks and robotic operations, and conducting research as expedition crewmembers. Several have distinguished themselves as senior leaders at NASA, including as the agency’s administrator. Looking to the future, Black astronauts are among those eligible for space station as well as exploration missions in the Artemis program.

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List of Black astronauts who have flown in space. 

Robert H. Lawrence 

Robert H. Lawrence holds the honor as the first Black astronaut selected for a space program. In June 1967, the U.S. Air Force selected Lawrence as a member of the third group of aerospace research pilots for the Manned Orbiting Laboratory (MOL) Program, a joint project of the Air Force and the National Reconnaissance Office to obtain high-resolution photographic imagery of America’s Cold War adversaries. Tragically, Lawrence lost his life in an aircraft accident in December 1967, and the Air Force cancelled the MOL Program in June 1969. Two months later, seven of the MOL astronauts transferred to NASA’s astronaut corps and all flew missions on the space shuttle. It is highly likely that had Lawrence lived, NASA would have selected him in that group, and he would have flown as the first Black astronaut.  

Arnaldo Tamayo Méndez 

The first person of African heritage to fly in space, Arnaldo Tamayo Méndez of Cuba, spent eight days aboard the Soviet Salyut-6 space station in 1980. The Cuban Air Force selected Tamayo Méndez as part of the Soviet Union’s Interkosmos program that flew cosmonauts from friendly socialist countries on short visiting flights to their space stations to conduct experiments for their national space programs and academic institutions.

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Left: Portrait of U.S. Air Force astronaut Robert H. Lawrence. Middle left: Lawrence, second from left, with his fellow Group 3 Manned Orbiting Laboratory astronauts. Middle right: Portrait of Cuban cosmonaut Arnaldo Tamayo Méndez. Right: Tamayo Méndez, second from left, with his Soviet crewmates aboard the Salyut-6 space station. 

Guion S. Bluford 

In January 1978, NASA selected its largest group of astronauts up to that time, 35 pilots and mission specialists, for the space shuttle program then under development. For the first time, NASA included women and minorities in the selection group, including three Blacks, one pilot and two mission specialists. One of the three, Guion S. “Guy” Bluford, became the first Black astronaut in space as a mission specialist aboard space shuttle Challenger’s STS-8 mission in 1983. During the six-day flight that featured the first night launch and night landing of the shuttle program, the astronauts deployed a communications satellite for India and performed tests with the remote manipulator system.

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Left: Selected in 1978, NASA astronauts Ronald E. McNair, left, Guion S. “Guy” Bluford, and Frederick D. Gregory. Middle: Bluford exercises on the treadmill in the middeck of space shuttle Challenger during the STS-8 mission. Right: Bluford, right rear, with his fellow STS-8 crew members. 

Bluford returned to space in October 1985 on Challenger’s STS-61A flight, serving as a mission specialist on Spacelab D1, a scientific mission sponsored by the West German space agency DLR. The flight marked the first and so far only time that eight astronauts launched aboard a single spacecraft. During their seven days in orbit, the international crew conducted 75 experiments in a variety of scientific disciplines.

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Left: Guion S. “Guy” Bluford, left, works on an experiment during the Spacelab D1 mission. Right: Bluford, lower right, with the rest of the eight-member international STS-61A crew. 

Making his third trip into space, Bluford launched aboard space shuttle Discovery in April 1991 on STS-39, the first flight to carry five mission specialists. During the eight-day unclassified mission for the Department of Defense (DOD), Bluford and his crewmates divided into two teams working around the clock. They conducted a series of observations of Earth’s upper atmosphere and its interactions with the shuttle orbiter. The mission’s unusually high 57-degree orbital inclination allowed the astronauts to observe most of the Earth’s landmasses. Using the shuttle’s remote manipulator system, they deployed and retrieved the Shuttle Pallet Satellite-II that conducted independent observations for two days, including monitoring shuttle thruster and engine firings.

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Left: Guion S. “Guy” Bluford on the flight deck of space shuttle Discovery. Right: Bluford, at left in the back, poses for the crew photo during STS-39. 

For his fourth and final spaceflight, Bluford lifted off aboard space shuttle Discovery in December 1992. During the seven-day STS-53 flight, the final DOD-dedicated mission, Bluford and his four crewmates deployed the third Satellite Data System-2 military communications satellite and conducted several unclassified experiments. On his four missions, he logged 688 hours of spaceflight time. Bluford retired from NASA in 1993 to join the private sector.

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Left: Guion S. “Guy” Bluford photographs the Earth with a video camcorder through the shuttle’s overhead window. Right: Bluford, left, poses with his STS-53 crewmates. 

Ronald E. McNair 

Also selected in the 1978 astronaut class, physicist Ronald E. McNair made his first space flight aboard space shuttle Challenger in February 1984. During the STS-41B mission, McNair and his crewmates deployed two commercial satellites and two of the astronauts tested the Manned Maneuvering Unit during the first two untethered spacewalks. McNair, an accomplished jazz saxophonist, became the first person to play a soprano sax in space. Space limitations in the shuttle precluded flying McNair’s favorite tenor sax, so he learned to play the smaller version of the instrument for his space flight. The eight-day mission ended with the first space shuttle landing back at NASA’s Kennedy Space Center (KSC) in Florida.

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Left: NASA mission specialist Ronald E. McNair plays the soprano saxophone in the middeck of space shuttle Challenger. Right: McNair, front and center, with the rest of the STS-41B crew. 

McNair’s next flight assignment was also on Challenger, the January 1986 STS-51L mission that included the first teacher in space. Although the mission plan did not include a spacewalk, McNair trained as one of the two astronauts to conduct one in case of a contingency. Tragically, the mission ended 63 seconds after liftoff when an explosion caused by a faulty solid rocket booster O-ring, resulted in the loss of the seven-member crew and the space shuttle Challenger. McNair had planned to play a saxophone solo during the STS-51L mission for composer Jean-Michel Jarre’s album Rendez-Vous, including participation in a concert via a live feed. As a tribute to McNair, Jarre entitled the album’s sixth and last piece Last Rendez-Vous (Ron’s Piece) – ‘Challenger’.

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Left: Astronaut Ronald E. McNair dons his spacesuit for contingency spacewalk training in the Weightless Environment Training Facility at NASA’s Johnson Space Center in Houston. Middle: McNair, front row right, in the official STS-51L crew photograph. Right: McNair, third in line, walks with the rest of the STS-51L crew to the Astrovan for the ride out to the launch pad. 

Frederick D. Gregory 

The third Black member of the class of 1978, U.S. Air Force pilot Frederick D. Gregory, made his first flight into space in April 1985 aboard space shuttle Challenger. On the STS-51B mission, Gregory became the first Black astronaut to pilot a space shuttle. During the seven-day Spacelab-3 science mission, the seven crew members divided into two teams to conduct 15 experiments in five different disciplines around the clock.

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Left: Astronaut Frederick D. Gregory on the flight deck of space shuttle Challenger. Right: Gregory, left and upside down, and the rest of the STS-51B crew in the Spacelab module. 

On his second trip into space, Gregory flew as the first Black commander of a space shuttle, the STS-33 mission of Discovery in November 1989. During the five-day flight, the five-member crew completed the primary goal of the DOD mission to deploy a Magnum electronic intelligence satellite.

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Left: STS-33 Commander Frederick D. Gregory displays a banner drawn and signed by Japanese students and by the superintendent of the Department of Defense Dependents School in Japan. Middle: Gregory takes photographs through the shuttle’s aft windows. Right: Gregory, left, with his STS-33 crewmates. 

Gregory once again served as commander on his third and final spaceflight, the DOD-dedicated STS-44 mission. During the seven-day November 1991 flight aboard space shuttle Atlantis, Gregory and his five crewmates deployed a Defense Support Program satellite designed to detect nuclear detonations and missile and space launches. After his third spaceflight, Gregory served at NASA Headquarters in Washington, D.C., in several high-level management positions. He served as NASA’s first Black deputy administrator from 2002 until his retirement from the agency in 2005.

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Left: STS-44 Commander Frederick D. Gregory talks to Mission Control from the middeck of space shuttle Atlantis. Middle: Gregory, front row left, in the onboard STS-44 crew photo. Right: Official NASA portrait of Gregory as deputy NASA administrator. 

Charles F. Bolden 

Selected in 1980 in the second group of space shuttle astronauts, U.S. Marine pilot Charles F. Bolden’s first spaceflight took place in January 1986 aboard space shuttle Columbia. He served as the pilot for the six-day STS-61C mission, the last mission before the Challenger accident, to deploy a commercial communications satellite. The flight also featured the first flight of a U.S. Congressman, C. William “Bill” Nelson, whose district included KSC, and who now serves as NASA’s 14th administrator. STS-61C marked the only mission to carry two future NASA administrators.

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Left: Charles F. Bolden in the pilot’s seat of space shuttle Columbia prepares for reentry. Right: Bolden, upper right, with his fellow STS-61C crew members. 

Bolden again served as pilot during his second trip into space in April 1990, the five-day STS-31 mission to deploy the Hubble Space Telescope, the orbiting observatory that has changed our view of the Universe in its more than 30 years of surveying the skies. The space shuttle Discovery reached a then-record altitude of 380 miles to place Hubble in its operational orbit well above the Earth’s atmosphere.

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Left: STS-31 pilot Charles F. Bolden in the airlock of space shuttle Discovery assists with contingency spacewalk preparations. Right: Bolden, upper left, with his STS-31 crewmates following the deployment of the Hubble Space Telescope. 

On his third spaceflight, Bolden flew as commander of STS-45, a nine-day mission aboard space shuttle Atlantis in March 1992. The seven-member crew, divided into two teams to provide uninterrupted data gathering 24-hours a day, operated 12 instruments from 7 countries mounted in the payload bay as part of the Atmospheric Laboratory for Applications and Science-01 mission. Bolden and his crew completed 250 maneuvers to bring Atlantis into the correct positions to obtain the required measurements.

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Left: STS-45 Commander Charles F. Bolden communicates on the amateur radio. Right: Bolden, front row right, poses with the rest of the STS-45 crew on the shuttle’s flight deck. 

Bolden returned to space for a fourth time as commander of Discovery’s STS-60 mission, the first flight of the Shuttle-Mir Program. Russian cosmonaut Sergei K. Krikalev flew as a mission specialist during the nine-day space shuttle mission that included a Spacehab module to conduct a variety of scientific experiments. During his four flights, Bolden logged more than 680 hours of spaceflight time. Shortly after STS-60, he retired from NASA and returned to the U.S. Marine Corps, serving there until 2004. In 2009, President Barack H. Obama nominated, and the Senate confirmed, Bolden as NASA’s 12th and its first Black administrator, a position he held until 2017.

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Left: STS-60 Commander Charles F. Bolden prepares space shuttle Discovery for reentry. Middle: Bolden, upper right, with his STS-60 crewmates. Right: Official NASA portrait of Bolden as the agency’s first Black administrator. 

Dr. Mae C. Jemison 

Selected as an astronaut in 1987, physician Dr. Mae C. Jemison became the first Black woman to fly in space in 1992 as a mission specialist on STS-47. She and her six crewmates conducted 44 life sciences and materials sciences experiments aboard Endeavour’s Spacelab-J mission, sponsored by Japan’s National Space Development Agency (NASDA), now the Japan Aerospace Exploration Agency. Jemison retired from NASA in 1993 but continued to promote space exploration, including writing children’s books and appearing in an episode of Star Trek: The Next Generation.

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Left: Mission Specialist Dr. Mae C. Jemison in the Spacelab-J module during the STS-47 mission. Right: Jemison, right, with the rest of the STS-47 crew, poses in the Spacelab-J module. 

Dr. Bernard A. Harris 

Flight surgeon Dr. Bernard A. Harris, selected as a NASA astronaut in 1990, completed his first space flight in April 1993 as a mission specialist on STS-55, the German Spacelab D2 mission. During the 10-day Columbia flight, Harris and his crewmates split into two shifts and conducted 88 experiments sponsored by 11 nations in six scientific disciplines.

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Left: Mission Specialist Dr. Bernard A. Harris works on a materials experiment in the Spacelab-D2 module during STS-55. Right: Harris, back row left, with his STS-55 crew mates. 

Harris returned to space on his second flight, as the first Black astronaut designated as the payload commander for a mission, in charge of managing the scientific experiments conducted in the Spacehab module. Discovery’s STS-63 mission, the second Shuttle-Mir flight, included a rendezvous with the Mir space station. The February 1995 mission also featured the first woman to pilot a space shuttle, Eileen M. Collins. During the eight-day mission, Harris conducted a 4-hour, 39-minute spacewalk, the first American African astronaut to do so. Harris retired from NASA in 1996, remaining active in the fields of medicine, research, and education.

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Left: Dr. Bernard A. Harris, right, prepares for a spacewalk during the STS-63 mission. Right: Harris, front row left, with the rest of the STS-63 crew on space shuttle Discovery’s flight deck. 

Winston E. Scott 

Aeronautical engineer Winston E. Scott, selected as a NASA mission specialist astronaut in 1992, completed his first spaceflight aboard the space shuttle Endeavour in January 1996. During the nine-day STS-72 mission, Scott participated in a 6-hour 54-minute spacewalk to test tools and techniques planned for use during the assembly of the space station. The six-person crew retrieved the NASDA Space Flyer Unit, a satellite launched in March 1995 to independently conduct materials science, biology, engineering, and astronomy research. The crew also deployed and two days later retrieved the Spartan-206 free-flyer satellite that carried four technology demonstrations and science experiments.

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Left: Mission Specialist Winston E. Scott reviews rendezvous procedures on space shuttle Endeavour’s flight deck. Right: Scott, upper right, with the rest of the STS-72 crew. 

For his second and final mission, Scott returned to space in November 1997 aboard the space shuttle Columbia. During the 16-day STS-87 mission, Scott participated in two spacewalks, bringing his total spacewalking experience to more than 22 hours. The crew conducted nine experiments in materials science, combustion science, and fundamental physics as part of the fourth U.S. Microgravity Payload. Scott retired from NASA in 1999 to return to his alma mater, Florida State University, as vice-president for student affairs.

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Left: Winston E. Scott deploys a prototype free-flying experiment during a spacewalk on the STS-87 mission. Right: Scott, lower right, with his STS-87 crewmates in space shuttle Columbia’s middeck. 

Robert L. Curbeam 

Selected as a NASA astronaut in 1994, aeronautical engineer Robert L. “Beamer” Curbeam made his first trip into space aboard space shuttle Discovery in August 1997 during the STS-85 mission. With study of the Earth the main goal of the 12-day flight, the crew deployed and retrieved the Cryogenic Infrared Spectrometers and Telescopes for the Atmosphere-Shuttle Pallet Satellite-2 (CRISTA-SPAS-2) spacecraft, a joint venture between NASA and the German space agency DLR. The three telescopes and four spectrometers aboard CRISTA-SPAS-2 spent more than 200 hours of free flight observing the Earth.

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Left: Mission Specialist Robert L. “Beamer” Curbeam photographs the Earth through one of space shuttle Discovery’s overhead windows. Right: Curbeam, left, poses for the inflight photo with the STS-85 crew. 

On his second flight in space, Curbeam launched aboard space shuttle Atlantis in February 2001. As a crew member on the 13-day STS-98 mission, Curbeam participated in the installation of the Destiny U.S. Laboratory module onto the space station, becoming the first Black astronaut to visit the orbital facility. He conducted three spacewalks totaling nearly 20 hours to complete external connections between the space station and Destiny.

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Left: Robert L. “Beamer” Curbeam during the second STS-98 spacewalk to install the Destiny U.S. Laboratory module onto the space station. Right: Curbeam, right, with the STS-98 and Expedition 1 crews. 

On his third and final flight, Curbeam returned to space, and to the space station, in December 2006, as part of the STS-116 crew aboard space shuttle Discovery. The 13-day flight marked the first time that two Black astronauts flew on the same mission. The crew installed the P5 truss segment on the ISS, with Curbeam completing four spacewalks to help accomplish the task. With his previous spacewalking experience, Curbeam holds the record among Black astronauts for the most number of spacewalks, seven, and the most spacewalking time, 45 hours 34 minutes. Curbeam retired from NASA in 2007, remaining active in space-related activities.

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Left: Robert L. “Beamer” Curbeam during the second STS-116 spacewalk to install the P5 truss segment onto the space station. Right: Curbeam, middle row at right, with the STS-116 and Expedition 14 crews. 

Michael P. Anderson 

Physicist Michael P. Anderson joined NASA’s astronaut corps in 1994 and made his first flight in space in January 1998 aboard the space shuttle Endeavour. As a mission specialist aboard STS-89, the eighth mission to dock with the space station Mir, Anderson was the first and only Black astronaut to visit the Russian orbital facility. He also conducted scientific experiments in the double Spacehab logistics module during the 9-day mission.

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Left: Michael P. Anderson works on an experiment in the middeck of space shuttle Endeavour. Right: Anderson, lower right, with the STS-89 and Mir Expedition 24 crews, poses for the inflight crew photo in Mir’s base block module. 

Anderson’s next spaceflight came in January 2003, the 16-day STS-107 research mission aboard space shuttle Columbia. With Anderson serving as payload commander, the seven-member crew split into two teams to work around the clock on more than 80 experiments in the fields of Earth and space science, advanced technology, and astronaut health and safety. Tragically, about 16 minutes before landing at KSC, space shuttle Columbia broke apart, with loss of the vehicle and the crew. Investigators traced the cause to a piece of foam that fell off the external tank during launch and struck Columbia’s left wing, creating an opening through which superheated gases during reentry impinged on the orbiter’s airframe, causing the vehicle to disintegrate.

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Left: Michael P. Anderson works on a combustion experiment in the Spacehab Double Research Module during the STS-107 mission. Right: Anderson, at upper right, with the rest of the STS-107 crew, poses for the inflight photograph in the Spacehab module. 

Stephanie D. Wilson 

Selected by NASA as an astronaut in 1996, aerospace engineer Stephanie D. Wilson completed her first mission in July 2006 aboard the space shuttle Discovery. The 13-day STS-121 mission, the second return to flight mission after the Columbia accident, resumed outfitting of the space station, including returning its crew size to three. Wilson handled much of the robotics operations, including transferring the Multi-Purpose Logistics Module (MPLM) Leonardo from the shuttle’s cargo bay to the ISS and back again. The MPLM delivered the first of three scientific refrigerator/freezers and other facilities to the space station to expand its research capabilities.

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Left: Stephanie D. Wilson at the controls of the space station’s robotic work station in the Destiny module. Right: Wilson, middle row left, with the STS-121 and Expedition 13 crews. 

On her second spaceflight in October 2007, Wilson returned to the space station, this time on the STS-120 mission of space shuttle Discovery. During the 15-day flight, the crew delivered the Harmony Node 2 module to the station, with Wilson robotically assisting in the installation of the new element that enabled the subsequent addition of the European and Japanese research modules.

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Left: Stephanie D. Wilson poses in front of the robotic workstation in the space station’s Destiny module. Right: Wilson, at left, poses with the STS-120 and Expedition 16 crews. 

In April 2010, Wilson made her third trip into space and her third visit to the space station. During the 15-day STS-131 mission, the MPLM Leonardo in space shuttle Discovery’s cargo bay delivered three research facilities and other cargo to the orbiting laboratory, with Wilson using the station’s robotic arm to transfer the MPLM to and from the station. During STS-131, for the first time four women worked in space at the same time, three members of the shuttle crew and the fourth a member of the Expedition 23 crew. To date, Wilson has accumulated 43 days of spaceflight time over the course of her three missions.  In January 2024, NASA assigned Wilson to the Crew 9 mission for a long-duration flight aboard the space station later in the year.

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Left: Stephanie D. Wilson poses in front of one of the two windows of the space station’s Kibo module.  Middle: Wilson, left, posing in the Cupola with three other women astronauts during the STS-131 mission, the first time that four women flew in space at the same time. Right: Wilson, front row second from right, poses with the STS-131 and Expedition 23 crews in Kibo.

Joan E. Higginbotham 

Selected in the astronaut class of 1996, electrical engineer Joan E. Higginbotham completed her single spaceflight in December 2006, the 13-day STS-116 mission aboard space shuttle Discovery. With Curbeam on the same crew, this marked the first time that two Black astronauts flew in space at the same time. Higginbotham operated the space station’s remote manipulator system to assist in the installation of the P5 truss segment to the facility. She retired from NASA in 2007 to pursue a career in the private sector.

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Left: Joan E. Higginbotham operates the controls of the International Space Station’s robotic work station in the Destiny module. Right: Higginbotham, front row to right of center, in the Destiny module with the STS-116 and Expedition 14 crews, the first time that two Black astronauts flew in space at the same time. 

B. Alvin Drew 

After his selection by NASA as an astronaut in 2000, physicist and aeronautical engineer B. Alvin Drew made his first spaceflight aboard space shuttle Endeavour in August 2007. During the 13-day STS-118 mission, Drew and his six crewmates installed the S5 truss segment on the space station, transferred 5,000 pounds of science experiments and other logistics from the single Spacehab module to the station, and returned 4,000 pounds of unneeded hardware to Earth. 

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Left: B. Alvin Drew transfers equipment into the space station. Right: Drew, middle row at left, with the STS-118 and Expedition 15 crews posing in the Destiny module. 

On his second and final trip into space in February 2011, Drew returned to the space station, this time on STS-133, the final flight of space shuttle Discovery. During the 13-day mission, Drew carried out two spacewalks totaling nearly 13 hours to complete a series of maintenance tasks on the station’s exterior.  Engineers on the ground converted the MPLM Leonardo into a Permanent Multipurpose Module (PMM) to provide additional storage capacity for the station. Drew and his five crewmates installed the PMM on the orbital facility. They also added a third platform for holding external payloads onto the station’s truss segment, and brought the Robonaut-2 humanoid robot to the orbiting laboratory. Drew currently serves as the NASA liaison to the Department of Defense at NASA Headquarters in Washington, D.C. 

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Left: B. Alvin Drew operates the space station’s robotic work station in the space station’s Destiny module. Right: Drew, front row at left, with his STS-133 and Expedition 26 crewmates. 

Leland D. Melvin 

Chemist and former National Football League player Leland D. Melvin, selected by NASA as an astronaut in 1998, made his first spaceflight aboard the space shuttle Atlantis in February 2008, the 13-day STS-122 mission. As a mission specialist, Melvin participated in the robotic operations to install the European Space Agency’s Columbus laboratory module on the space station. 

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Left: Leland D. Melvin operates the space station’s robotic work station in the Destiny module. Right: Melvin, at center in rear, during mealtime with his STS-122 and Expedition 16 crewmates in the Zvezda service module. 

Melvin returned to space and to the space station in November 2009 aboard Atlantis. During the 11-day STS-129 mission, the crew installed two external carriers for payloads onto the station’s truss, with Melvin operating the shuttle’s robotic arm. After his second and final spaceflight, NASA managers recognized Melvin’s passion for engaging with students of all ages and named him associate administrator for the Office of Education at NASA Headquarters in 2010. He served in that position until his retirement from the agency in 2014. Melvin continues to promote human spaceflight and education.

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Left: Astronaut Leland D. Melvin reflected in the lid of the Lada greenhouse in the Zvezda service module. Middle: Melvin, left of center, poses with his STS-129 and Expedition 21 crewmates. Right: Official photograph of Melvin as NASA associate administrator for the Office of Education. 

Dr. Robert L. Satcher 

Selected by NASA in 2004 as an astronaut, orthopedic surgeon Dr. Robert L. “Bobby” Satcher flew his only space mission in November 2009, an 11-day flight aboard space shuttle Atlantis. As a mission specialist on the STS-129 crew, Satcher participated in the installation of two external payload carriers onto the space station’s truss, including conducting two spacewalks totaling more than 12 hours. He retired from NASA in 2011 to join The University of Texas M.D. Anderson Cancer Center’s orthopedic oncology department. 

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Left: Astronaut Dr. Robert L. “Bobby” Satcher floats in the space station’s Destiny module. Right: Satcher, second row at right, with his STS-129 and Expedition 21 crewmates. 

Victor J. Glover 

NASA selected U.S. Navy test pilot Victor J. Glover as an astronaut in 2013. He launched in November 2020 aboard Space Exploration Technology Corporation’s (SpaceX) commercial Crew Dragon Resilience spacecraft. The Crew 1 mission marked the first use of the Crew Dragon for a space station crew rotation. Glover became the first Black astronaut to join a long-duration expedition crew aboard the station, and his arrival with his three crewmates marked the first time the facility’s resident crew size increased to seven people, significantly increasing the crew time available to conduct research. Glover logged 167 days in space during his mission as a member of Expedition 64 and 65. On April 3, 2023, NASA named Glover as the pilot for Artemis II, the first crewed mission on NASA’s path to establishing a long-term presence at the Moon for science and exploration. 

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Left: Astronaut Victor J. Glover conducts a spacewalk during Expedition 64. Right: Glover, left, with his Expedition 64 crewmates in the Cupola module.  

Sian H. Proctor 

Geologist Sian H. Proctor flew as one of the four crew members on the all-civilian Inspiration4 mission aboard the SpaceX Crew Dragon capsule Resilience. Proctor, the first Black woman pilot in space, carried with her a fragment of the Canyon Diablo meteorite that 50,000 years ago created the Barringer Crater in Arizona, also known as Meteor Crater. She also conducted experiments during the three-day flight in September 2021. 

proctor_w_meteorite_on_inspiration4_sep_2021_spacex proctor_w_inspiration4_crew_on_orbit_sep_2021_spacex

Left: Sian H. Proctor with a fragment of the Canyon Diablo meteorite she flew to space aboard the all-civilian Inspiration4 mission. Right: Proctor, right, with her fellow Inspiration4 crewmates. 

Jessica A. Watkins 

Jessica A. Watkins, selected for NASA’s 2017 astronaut class, launched aboard Crew Dragon Freedom as part of the Crew 4 mission in April 2022, becoming the first Black woman to join a long-duration mission. Watkins, the first NASA geologist to fly in space since Apollo 17’s Harrison H. “Jack” Schmitt in 1972, completed a 171-day mission aboard the space station, returning to Earth in October 2022. During her stay as a member of Expeditions 67 and 68, she conducted dozens of experiments. During the handover between Crew 4 and Crew 5, for the first time in history, five women worked in space at the same time, four aboard the International Space Station and one aboard China’s Tiangong space station. Watkins remains eligible for future mission assignments.  

watkins_melfi_exp_68 watkins_birthday_exp_67_may_14_2022

Left: Astronaut Jessica A. Watkins places biological samples into the Minus Eighty-degree Laboratory Freezer for ISS during Expedition 68. Right: Expedition 67 crew members help Watkins, center, celebrate her birthday aboard the space station. 

Jeanette J. Epps 

Selected as an astronaut in 2009, Jeanette J. Epps will make her first trip into space as a member of Crew 8, scheduled for launch in February 2024 aboard a SpaceX Crew Dragon. Epps and her three crewmates will join the Expedition 70 and 71 crews for a planned six-month mission aboard the space station to conduct more than 200 experiments. 

.black-history-month-2024-83-epps-crew-8- black-history-month-2024-84-epps-crew-8-

Left: NASA astronaut Jeanette J. Epps, right, poses with her Crew 8 crewmates for the official photograph. Right: Epps, left, and her Crew 8 crewmates during a training session. 

To be continued… 

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      Site-Based Observations of a Saharan Dust Storm’s Impacts on Evapotranspiration in North-Central Florida
      Jayce Crayne
      Saharan dust storms serve an important role in the western Atlantic’s climate in their contribution to Earth’s radiation budget, modulating sea surface temperatures (SSTs), fertilizing ecosystems, and suppressing cloud and precipitation patterns (Yuan et al., 2020). However, Saharan dust storms are expected to become less frequent in this region as SSTs continue to rise (Yuan et al., 2020). Predicting the climate response to this change requires a keen understanding of how the presence of these storms affect evapotranspiration (ET) and its indicators. This study utilizes site-based observational data from an AmeriFlux tower near Gainesville, FL recorded during a large dust storm in late June 2020. The storm’s progression was documented using satellite imagery from Aqua and Terra and aerosol optical depth (AOD) measurements from an Aerosol Robotic Network (AERONET) station co-located with the AmeriFlux tower. Indicators of ET such as surface air temperature, vapor pressure deficit, photosynthetic photon flux density, and net radiation were analyzed. Findings were compared to modeled ET and latent energy flux reanalysis data provided by the Global Land Data Assimilation System (GLDAS). Both model simulations and on-site observations support that ET decreased during the days dust concentrations were heaviest and for a short time thereafter. Cloud cover data adopted from meteorological aerodrome reports (METARs) provided by an automated surface observing system (ASOS) located in Gainesville showed that clouds were not a major contributor in decreasing ET during the days of heaviest dust. The results of this study show a considerable decrease in ET as a result of dust aerosols. Further research is necessary to determine whether changes in ET due to Saharan dust storms are significant enough to alter climates in the western Atlantic and, if so, what the climate response will be if the frequency of storms decreases.

      Brandon Wilson
      Predicting 2025 and 2028 dNBR and dNDIV for Csarf Smith River Complex / Evaluating the Effects of 2019 California Wildfire Fund
      Brandon Wilson
      Biodiverse regions across California remain vulnerable to harmful wildfires year round. Quantifying and measuring these regions’ wildfire resilience is necessary for understanding where/how to allocate environmental resources. Several ecological wildfire studies have been conducted utilizing artificial intelligence and remote sensing to analyze and predict biodiversity damage across wildfire prone regions, including Northern Algeria and Arkansas, USA. The current case study aims to analyze biodiversity damage from the 2023 Csarf Smith River Complex Fire in Six Rivers National Forest, California and predict the difference in Normalized Burn Ratio (dNBR) and difference in Normalized Difference Vegetation Index (dNDVI) for 2025 and 2028 using remote-sensing-based random forest (RF) regression. Furthermore, to observe, holistically, a practical method California has implemented to address state-wide wildfire damage, the 2019 California Wildfire Fund (AB 1054 and AB 111) was evaluated using the synthetic control method (SCM). For this case study, remote sensing data from the United States Geological Survey (USGS) and NASA (Landsat 9 Satellite C2 L2, TerraClimate and the Land Data Assimilation System) were utilized for processing relevant spectral indexes for the RF. Data from NOAA, Energy Information Agency, International Monetary Fund and Bureau of Economic Analysis were utilized as synthetic control datasets to evaluate the effects of the 2019 California Wildfire Fund. Elevated topography in this study area is susceptible to high severity burn effects, while less elevated topography burns less. This result affected dNBR and dNDVI predictions as elevated areas seemingly did not have strong resilience to rampant burns. This demonstrates a direct correlation to potential lower transpiration rates for elevated areas, warranting further analysis. Results of low variance, post-treatment, between the treated unit and the synthetic control unit, poses concern for the positive effect of the 2019 Wildfire Fund.

      Carrie Hashimoto
      Describing changes in evapotranspiration following the 2020 Creek Fire in the southern Sierra Nevada
      Carrie Hashimoto
      Climatic warming and high tree density have caused larger and more severe wildfires to occur in western United States forests over time. Wildfires affect both the hydrology and ecology of forests via alterations to the water balance (e.g., evapotranspiration, streamflow, infiltration, and more) and could shift vegetation communities and subsequent ecosystem structure and function. This project explores ecological characteristics of a landscape that predict the extent to which the Creek Fire in the southern Sierra Nevada has affected evapotranspiration. Strides in understanding of consequential evapotranspiration changes can create pathways to address emerging forest health challenges posed by similar western fires. For analysis, various remote sensing and modeled data were collected from OpenET, the North American Land Data Assimilation System, TerraClimate, Harmonized LandSat Sentinel-2 data, and the Shuttle Radar Topography Mission. Multiple linear regression and generalized additive models were constructed. Relative change in evapotranspiration served as the response variable. Model covariates included average temperature, total precipitation in the preceding months, average soil moisture, elevation, slope, aspect, northness, latitude, pre-fire normalized difference vegetation index (NDVI), and post-fire change in normalized burn ratio (dNBR). Best subset selection with cross validation demonstrated minimization of cross-validation error with a 7-covariate model. This reduced model yields lower complexity and more interpretability while sustaining an adjusted R2 of 0.626, compared to the full model’s adjusted R2 of 0.663. A reduced generalized additive model (GAM) with interaction terms drawn from the linear model variable selection demonstrated an adjusted R2 of 0.695, indicating a better fit that comes at the cost of reduced interpretability and higher computational requirements than the linear models. The goal of this work is to disentangle environmental indicators of post-fire evapotranspiration change, such that predictive modeling of future wildfire impacts on evapotranspiration can be achieved.


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      Last Updated Nov 22, 2024 Related Terms
      General Explore More
      8 min read SARP East 2024 Ocean Remote Sensing Group
      Article 21 mins ago 10 min read SARP East 2024 Atmospheric Science Group
      Article 21 mins ago 11 min read SARP East 2024 Terrestrial Fluxes Group
      Article 22 mins ago View the full article
    • By NASA
      11 min read
      Preparations for Next Moonwalk Simulations Underway (and Underwater)
      Return to 2024 SARP Closeout Faculty Advisors:
      Dr. Lisa Haber, Virginia Commonwealth University
      Dr. Brandon Alveshere, Virginia Commonwealth University
      Dr. Chris Gough, Virginia Commonwealth University
      Graduate Mentor:
      Mindy Priddy, Virginia Commonwealth University

      Mindy Priddy, Graduate Mentor
      Mindy Priddy, graduate mentor for the 2024 SARP Terrestrial Fluxes group, provides an introduction for each of the group members and shares behind-the scenes moments from the internship.

      Angelina De La Torre
      Using NDVI as a Proxy for GPP to Predict Carbon Dioxide Fluxes
      Angelina De La Torre
      Climate change, driven primarily by greenhouse gases, poses a threat to the future of our planet. Among these gases is carbon dioxide (CO₂), which has a much longer atmospheric residence time compared to other greenhouse gases. One potential factor in reducing atmospheric CO₂ enrichment is plant productivity. Gross Primary Productivity (GPP) estimates the amount of CO₂ fixed during photosynthesis. The Normalized Difference Vegetation Index (NDVI) provides insight into the health of an ecosystem by measuring the density and greenness of vegetation. Therefore, it can be inferred that there is a relationship between NDVI and GPP, as greener plants are likely more productive. In this study, we used NDVI as a proxy for GPP and analyzed the effect NDVI had on CO₂ fluxes during California’s wet season between January and March 2023 in a restored tidal freshwater wetland. GPP and CO₂ flux data were obtained from the Dutch Slough AmeriFlux tower in Oakley, California. Landsat data were used to calculate the average NDVI. The influence of NDVI on GPP was assessed using linear regression. A second linear regression was then performed using NDVI and CO₂ flux, of which GPP is one component. We anticipate that wetlands with greater vegetation density will have lower CO₂ emissions.

      Because Landsat data scans in 16-day intervals, daily variation in NDVI could not be observed. This translates to a frequency discrepancy between the Landsat and AmeriFlux data, as AmeriFlux towers measure in half-hour intervals. Additionally, the wet season represented was limited by data availability, as the data before 2023 were unavailable. Despite data limitations in this study, the outlined process could be repeated in various wetland and climate classifications for further analysis of a larger sample size. This study could assist in developing strategies to increase CO₂ sequestration in an attempt to slow the effects of climate change.

      Samarth Jayadev
      Using Machine Learning to Assess Relationships between NDVI and Net Carbon Exchange During the COVID-19 Pandemic
      Samarth Jayadev
      Understanding the movement of carbon between Earth’s land surface and atmosphere is essential for ecosystem monitoring, creating climate change mitigation strategies, and assessing the carbon budget on national to global scales. Measures of greenness serve as indicators of processes such as photosynthesis that control carbon exchange and are vital in modeling of carbon fluxes. NASA’s Orbiting Carbon Observatory (OCO-2) provides high quality measurements of column-averaged CO₂ concentrations that can be used to derive net carbon exchange (NCE), a measure of CO₂ flux between terrestrial ecosystems and the atmosphere.
      From OCO-2, NCE data collected at the land nadir, land glint satellite position combined with in situ sampling can provide accurate measurements on a 1°x1° scale suitable for carbon flux characterization across the contiguous United States (CONUS). Normalized difference vegetation index (NDVI), which ranges from -1 to +1, measures the greenness of vegetation, serving as an indicator of plant density and health. This can help to understand ecosystem to carbon-cycle interactions and be leveraged for determining patterns with NCE. We examined the relationship between NDVI and NCE across CONUS during 2020 using Gradient Boosting Decision Trees (GBDT) which specialize in classifying and predicting non-linear relationships. This algorithm takes multiple weak learners (decision trees) and combines their predictions in an iterative ensemble method to improve prediction accuracy. Feature and permutation importance tests found that January and August (trough and peak NDVI, respectively) were the highest weighted predictor variables related to NCE. The dataset was split in a 90% training 10% test ratio across latitude/longitude grid cells to assess and verify model performance. Using the mean squared error loss function and hyperparameters with optimal estimators, tree depth, sample split, and learning rate the algorithm was able to converge the test predictions to match the deviance of the training data. The gradient boosting model can be applied to different months and years of NDVI/NCE to further explore these relationships or a multitude of research questions. Further studies should consider integrating land use and land cover change variables such as bare land and urbanization to improve predictions of NCE.

      Makai Ogoshi
      Deep-learning Derived Spaceborne Canopy Structural Metrics Predict Forest Carbon Fluxes
      Makai Ogoshi
      Terrestrial and airborne lidar data products describing canopy structure are potent predictors of forest carbon fluxes, but whether satellite data products produce similarly robust indicators of canopy structure is not known. The assessment of contemporary spaceborne lidar and other remote sensing data products as predictors of carbon fluxes is crucial to next generation instrument and data product design and large-spatial scale modeling. We investigated relationships between deciduous broadleaf forest canopy structure, derived from deep-learning models created with lidar data from GEDI and optical imagery from Sentinel-2, and forest carbon exchange. These included comparisons to in-situ continuous net ecosystem exchange (NEE), gross primary production (GPP), and net primary production (NPP). We find that the mean  canopy height from the gridded spaceborne product has a strong correlation with forest NPP, similar to prior analysis with ground-based lidar (portable canopy lidar; PCL). For comparison to NPP, heights taken from the gridded spaceborne product were compared by overlapping the product with nine terrestrial forest sites from the National Ecological Observatory Network (NEON). We used standard deviation of canopy height as a measure of canopy structural complexity. Complexity derived from the gridded spaceborne product does not show the same strong correlation with NPP as found when using PCL. Mean annual GPP and NEE across five years were compared to the gridded spaceborne product at six Fluxnet2015-tower sites with continuous, gap-filled carbon flux data. When compared to in-situ flux tower data, neither mean canopy height nor structural complexity strongly correlate to annual NEE or GPP. Primarily, the finding that derived spaceborne products exhibit a strong correlation between forest canopy height and NPP will advance global-scale application of forest-carbon flux predictions. Secondarily, a variety of limitations highlight shortcomings in the current terrestrial flux data network. A small number of available study sites, both spatially and temporally, and lack of resolution in vertical complexity of canopy structure both contribute to uncertainty in assessing the relationships to NEE and GPP.

      Sebastian Reed
      Porewater Methane Concentrations Vary Significantly Across A Freshwater Tidal Wetland
      Sebastian Reed
      Methane is a potent greenhouse gas that is over 80 times more powerful than CO₂ at trapping heat and accounts for an estimated 30% of global temperature rise associated with climate change. The largest natural source of methane worldwide is wetlands. Despite the role of methane in driving climate change, the magnitude of global annual wetland methane flux remains highly uncertain. This study analyzes the effects of greenness (assessed using Normalized Difference Vegetation Index; NDVI), plant species composition, rooting depth, atmospheric methane concentration, and plant longevity on porewater methane concentration at the Kimages Rice Rivers Center tidal freshwater wetland. Samples for atmospheric and porewater concentrations were conducted in situ in June 2024. For each sampling location (n = 23) we collected whole air samples (WAS) 2m above the marsh surface and porewater samples 5cm below the marsh surface. We visually assessed species composition at each sample location, with 12 species of wetland plants present overall. We used the TRY plant database to find the rooting depth, leaf nitrogen content, and lifespan of each species. Drone multispectral data from 2023 was used to estimate NDVI values. These variables were compared to the pore water methane concentration via stepwise linear regression. Leaf N content, NDVI, plant species, and WAS sampling did not show statistically significant correlation to porewater methane concentration. Rooting depth showed a slight positive correlation with porewater methane (alpha = 0.1, p = 0.08, R^2 = 0.1). Samples with only perennial plants (as opposed to annual plants) had a higher mean value of porewater methane (p = 0.1). Analyzing porewater methane provides insight as to what wetland components affect methanogenesis and methane release, which aids in assessing which plant functional traits are most responsible for driving or mitigating climate change. Results from this study and future research in this area has the potential to more accurately assess how methane cycles through wetlands to the atmosphere.

      Nohemi Rodarte
      Understanding the vertical profile of CO₂ concentration: How carbon dioxide levels change with altitude
      Nohemi Rodarte
      Carbon dioxide (CO₂) is one of the main greenhouse gasses that contribute to global warming.While the relationship between CO₂ concentrations and land cover types, such as forests and urban areas, is well documented, there is limited knowledge of how CO₂ concentrations vary with altitude at fine spatial scales. Guided by our hypothesis that CO₂ levels vary with altitude and increase with elevation, we used airborne data collected from the B200 aircraft, which flew at different altitudes (400 to 1200 feet) above the urban area of Hopewell, Virginia, between 9:40 AM and 10:40 AM. We analyzed the CO₂ concentrations recorded by the flight to obtain the median and range for each 100 feet of altitude. Our results reveal that carbon dioxide concentrations varied significantly across the range of altitudes investigated. Within the area studied, CO₂ concentrations were found to range between 410 and 470 ppm. The distribution of these concentrations along the altitude gradient shows a bimodal pattern, with notable peaks at altitudes of 700 to 800 feet and 1100 to 1200 feet. Although CO₂ levels were present at all measured altitudes, there was a noticeable drop in the mean concentration at 800 feet,which then stabilized until reaching 1,000 feet before rising again. This pattern indicates that the concentrations of this greenhouse gas are not uniformly distributed with altitude, but rather vary significantly, showing higher concentrations at certain elevations and lower concentrations at others. The CO₂ distribution fluctuates with altitude, showing higher or lower levels at specific heights rather than a smooth gradient, indicating that altitude impacts CO₂ concentrations. While we did not identify the drivers of this change, future studies could evaluate how factors such as surface emissions, atmospheric mixing, and local conditions may contribute to vertical CO₂ profiles, since the altitudes we considered in this research are within the troposphere.

      Camille Shaw
      Linking NDVI with CO₂ and CH₄ Fluxes: Insights into Vegetation and Urban Source-Sink Dynamics in the Great Dismal Swamp
      Camille Shaw
      In recent years, carbon dioxide, methane, and other greenhouse gases have gained attention because of their contribution to the rise in Earth’s global mean temperature. Methane and carbon dioxide have various sources and sinks, but an expanding array of sources have created a need to assess ongoing change in carbon balance. This study aims to quantify the relationship between Normalized Difference Vegetation Index, or NDVI, and methane and carbon dioxide fluxes. We measured carbon dioxide and methane concentrations within the boundary layer using the PICARRO instrument, focusing on the Great Dismal Swamp, a forested wetland, and surrounding areas in the Eastern Mid-Atlantic Region. Data collection occurred at various times of day and along different flight paths in 2016, 2017, and 2024, with each year representing data from a single season, either spring or fall, for temporal analysis. We calculated methane and carbon dioxide fluxes along the flight paths using airborne eddy covariance, a method for capturing accurate flux measurements while accounting for the mixing of gases in the boundary layer caused by heat. Additionally, we calculated NDVI for this area using NASA’s Landsat 8 and 9 satellite imagery. Analysis of the afternoon flight data revealed a negative linear correlation between NDVI and carbon dioxide flux. Urban areas, characterized by low NDVI, exhibit a positive carbon dioxide flux as a consequence of emissions from vehicles, while forested areas, with high NDVI, show a negative carbon dioxide flux because of photosynthesis. In contrast, methane flux shows minimal correlation with NDVI. The lack of correlation arises because forested wetlands, with high NDVI, emit substantial amounts of methane, while urban areas, despite having low NDVI, still produce significant methane emissions from landfills and industrial activities. Future research could further investigate how seasonal and diurnal variations influence the correlations between NDVI and greenhouse gases by collecting comprehensive data across all seasons within a given year and at various times of the day.

      Return to 2024 SARP Closeout Share
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      Last Updated Nov 22, 2024 Related Terms
      General Explore More
      8 min read SARP East 2024 Ocean Remote Sensing Group
      Article 21 mins ago 10 min read SARP East 2024 Atmospheric Science Group
      Article 21 mins ago 10 min read SARP East 2024 Hydroecology Group
      Article 21 mins ago View the full article
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