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30 Years Ago: NASA Selects its 15th Group of Astronauts 


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On Dec. 8, 1994, NASA announced the selection of its 15th group of astronauts. The diverse group comprised 19 candidates – 10 pilots and nine mission specialists, and included five women, two African Americans, one Asian American, and the first Peruvian-born and Indian-born astronauts. Four international astronauts, one each from Canada and Japan and two from France, joined the group later for astronaut candidate training, following which all 23 became eligible for spaceflight assignment. The two French candidates had previous spaceflight experience in cooperative missions with Russia. All members of the group completed at least one spaceflight, making significant contributions to assembly and maintenance of the space station and carrying out important science missions. Three perished in the Columbia accident. 

The Group 15 NASA and international astronaut candidates pose for a group photo – front row, Jeffrey S. Ashby, left, Dafydd “Dave” R. Williams, James F. Reilly, Scott D. Altman, Rick D. Husband, and Michael J. Bloomfield; middle row, Pamela A. Melroy, left, Michael P. Anderson, Michel Tognini, Kathryn “Kay” P. Hire, Kalpana Chawla, Carlos I. Noriega, Susan L. Still, Takao Doi, and Frederick “Rick” W. Sturckow; back row, Janet L. Kavandi, left, Edward T. Lu, Steven K. Robinson, Robert L. Curbeam, Dominic L.P. Gorie, Joe F. Edwards, Steven W. Lindsey, and Jean-Loup Chrétien.
The Group 15 NASA and international astronaut candidates pose for a group photo – front row, Jeffrey S. Ashby, left, Dafydd “Dave” R. Williams, James F. Reilly, Scott D. Altman, Rick D. Husband, and Michael J. Bloomfield; middle row, Pamela A. Melroy, left, Michael P. Anderson, Michel Tognini, Kathryn “Kay” P. Hire, Kalpana Chawla, Carlos I. Noriega, Susan L. Still, Takao Doi, and Frederick “Rick” W. Sturckow; back row, Janet L. Kavandi, left, Edward T. Lu, Steven K. Robinson, Robert L. Curbeam, Dominic L.P. Gorie, Joe F. Edwards, Steven W. Lindsey, and Jean-Loup Chrétien.
Credit: NASA

The newest class of NASA astronaut candidates included pilot candidates Scott D. Altman, Jeffrey S. Ashby, Michael J. Bloomfield, Joe F. Edwards, Dominic L.P. Gorie, Rick D. Husband, Steven W. Lindsey, Pamela A. Melroy, Susan L. Still, and Frederick “Rick” W. Sturckow, and mission specialist candidates Michael P. Anderson, Kalpana Chawla, Robert L. Curbeam, Kathryn “Kay” P. Hire, Janet L. Kavandi, Edward T. Lu, Carlos I. Noriega, James F. Reilly, and Steven K. Robinson. A January 1995 agreement among the agencies enabled Canadian Space Agency (CSA) astronaut Dafydd “Dave” R. Williams and Takao Doi of the National Space Development Agency (NASDA), now the Japan Aerospace Exploration Agency, to join the 19 NASA astronauts for training. Another agreement between NASA and the French space agency CNES enabled astronauts Jean-Loup Chrétien and Michel Tognini to also join the group. Both Chrétien and Tognini had previous spaceflight experience through joint agreements with Russia, and their experience proved helpful to NASA in the fledgling Shuttle-Mir Program. 

Group 15 astronaut candidates experience short-duration weightlessness aboard NASA’s KC-135 aircraft.
Group 15 astronaut candidates experience short-duration weightlessness aboard NASA’s KC-135 aircraft.
Credit: NASA

The 19 NASA candidates along with Williams and Doi reported to work at NASA’s Johnson Space Center in Houston on March 6, 1995, to begin their one-year training period. The two French astronauts joined them later. During the yearlong training, the candidates attended classes in applied sciences, space shuttle and space station systems, space medicine, Earth and planetary sciences, and materials sciences. They visited each of the NASA centers to learn about their functions and received instruction in flying the T-38 Talon training aircraft, high-altitude and ground egress systems, survival skills, parasail flight, and scuba. They experienced short-duration weightlessness aboard NASA’s KC-135 aircraft dubbed the Vomit Comet. After completing the astronaut candidate training, they qualified for various technical assignments within the astronaut office leading to assignments to space shuttle crews. 

The 19 NASA candidates along with Williams and Doi reported to work at NASA’s Johnson Space Center in Houston on March 6, 1995, to begin their one-year training period. The two French astronauts joined them later. During the yearlong training, the candidates attended classes in applied sciences, space shuttle and space station systems, space medicine, Earth and planetary sciences, and materials sciences. They visited each of the NASA centers to learn about their functions and received instruction in flying the T-38 Talon training aircraft, high-altitude and ground egress systems, survival skills, parasail flight, and scuba. They experienced short-duration weightlessness aboard NASA’s KC-135 aircraft dubbed the Vomit Comet. After completing the astronaut candidate training, they qualified for various technical assignments within the astronaut office leading to assignments to space shuttle crews. 

Per tradition, the previous astronaut class provided the nickname for Group 15. Originally, The Class of 1992, The Hogs, dubbed them The Snails because NASA had delayed their announcement. Then after the addition of the two French astronauts, they felt that The Flying Escargots seemed more appropriate. The Group 15 patch included an astronaut pin rising from the Earth, an orbiting space shuttle and space station, and flags of the United States, Canada, France, and Japan. 

Group 15 patch.
Group 15 patch.
Credit: NASA

Altman, a U.S. Navy pilot, hails from Illinois. He received his first spaceflight assignment as pilot of STS-90, the 16-day Neurolab mission in 1998, along with fellow Escargots Hire and Williams. He again served as pilot on STS-106, a 12-day space station resupply mission in 2000, accompanied by fellow Escargot Lu. He served as commander on his third mission, STS-109, the 11-day fourth Hubble Space Telescope (HST) servicing mission in 2002. He commanded his fourth and final mission, the 13-day final HST servicing mission, STS-125, in 2009. Altman logged a total of 51 days in space. 

Anderson, a native of upstate New York and a lieutenant colonel in the U.S. Air Force, received his first assignment as a mission specialist on STS-89, the nine-day eighth docking with Mir. Fellow Escargots Edwards and Reilly flew with Anderson, who has the distinction as the only African American astronaut to visit that space station during the mission in 1998. He next served as payload commander on the 16-day STS-107 Spacehab research mission in 2003, flying with fellow Escargots Chawla and Husband. Anderson perished in the Columbia accident. He logged nearly 25 days in space. 

Texas native and U.S. Navy captain Ashby received his first spaceflight assignment as pilot of STS-93, the five-day mission in 1999 to deploy the Chandra X-ray Observatory. Fellow Escargot Tognini served as a mission specialist on this flight. On his second mission, Ashby served as pilot of STS-100, the 12-day flight in 2001 that delivered the Canadarm2 robotic arm to the space station. Ashby commanded his third and final mission in 2002, STS-112, the 11-day space station assembly flight that delivered the S1 truss. Fellow Escargot Melroy served as pilot on this flight. During his three missions, Ashby spent nearly 28 days in space. 

Hailing from Michigan, U.S. Air Force Colonel Bloomfield received his first flight assignment as pilot of STS-86, the seventh Mir docking mission. The 11-day flight took place in 1997, with fellow Escargot Chrétien serving as a mission specialist. Bloomfield served as pilot on his second flight, STS-97, the 11-day station assembly mission in 2000 that delivered the P6 truss and the first set of U.S. solar arrays. Fellow Escargot Noriega flew as a mission specialist on this flight. Bloomfield served as commander on his third and final mission, the 11-day STS-110 assembly flight that delivered the S0 truss segment in 2002. Bloomfield logged a total of 32 days in space across his three missions. 

Chawla, the first Indian-born NASA astronaut, earned a doctorate in aerospace engineering. She received her first spaceflight assignment as a mission specialist on STS-87, the 16-day flight in 1997 that carried the fourth U.S. Microgravity Payload (USMP-4). Fellow Escargot Lindsey served as pilot on this mission, during which Chawla used the shuttle’s robotic arm to release and capture the SPARTAN-201-4 free flyer. She next served as a mission specialist on the STS-107 Spacehab research mission in 2003, along with fellow Escargots Anderson and Husband. Chawla perished in the Columbia accident. She logged nearly 32 days in space.

On his first spaceflight, Curbeam, a native of Baltimore and commander in the U.S. Navy, flew as a mission specialist on STS-85, a 12-day mission in 1997 that carried the CRISTA-SPAS-2 free flyer. Fellow Escargot Robinson accompanied Curbeam on this mission. On his next flight, he served as a mission specialist on STS-98, the 2001 station assembly flight that delivered the Destiny U.S. Lab. During that 13-day flight, Curbeam participated in three spacewalks, spending nearly 20 hours outside. On his third and final spaceflight, he served as a mission specialist on STS-116, the 13-day assembly flight in 2006 that delivered the P5 truss segment. Curbeam participated in four spacewalks to reconfigure the station’s power system, spending nearly 26 hours outside. Across his four flights, Curbeam spent more than 37 days in space, and across his seven spacewalks more than 45 hours outside.  

Edwards, a native of Virginia and U.S. Navy commander, flew his single spaceflight as pilot of STS-89, the eighth Mir docking mission in 1998. Fellow Escargots Anderson and Reilly flew with him as mission specialists on this flight. Edwards spent nine days in space. 

A native of Louisiana and U.S. Navy captain, Gorie received his first spaceflight assignment as pilot of STS-91, the 10-day ninth and final Mir docking mission in 1998, along with fellow Escargot Kavandi. In 2000, he served as pilot of STS-99, the 11-day Shuttle Radar Topography Mission (SRTM), once again with fellow Escargot Kavandi. Gorie commanded his third mission, STS-108 in 2001, the first station Utilization Flight that lasted 12 days. He also commanded his fourth and final flight, accompanied by fellow Escargot Doi, the 16-day STS-123 mission in 2008 that delivered the Japanese pressurized logistics module and the Canadian Special Purpose Dexterous Manipulator (SPDM) to the station. Over his four missions, Gorie spent more than 48 days in space. 

A native of Alabama and a captain in the U.S. Navy Reserve, Hire completed her first space mission in 1998 as a mission specialist on the 16-day STS-90 Neurolab mission, along with fellow Escargots Altman and Williams. Twelve years later, Hire flew her second and last mission, STS-130, a 14-day space station assembly mission that installed the Node 3 Tranquility module and the Cupola. During her two flights, Hire spent nearly 30 days in space. 

Hailing from Amarillo, Texas, and a colonel in the U.S. Air Force, Husband flew as the pilot of STS-96 on his first flight. The 10-day space station resupply mission took place in 1999. He served as commander on his second flight, the 16-day STS-107 Spacehab research mission in 2003, along with fellow Escargots Anderson and Chawla. Husband perished in the Columbia accident. He logged nearly 26 days in space. 

Missouri native Kavandi completed her first spaceflight as a mission specialist on STS-91, the 10-day ninth and final Mir docking mission in 1998, along with fellow Escargot Gorie. On her second flight, she served as a mission specialist on the 11-day STS-99 SRTM in 2000, once again with fellow Escargot Gorie. As a mission specialist on STS-104, her third and final spaceflight, Kavandi flew with fellow Escargots Lindsey and Reilly to install the Quest airlock on the station. On her three flights, she logged 34 days in space. Kavandi served as director of NASA’s Glenn Research Center in Cleveland from March 2016 to September 2019. 

A colonel in the U.S. Air Force, California-born Lindsey has the distinction as the only member of his class to complete five spaceflights. He served as pilot on his first spaceflight in 1997, the 16-day STS-87 USMP-4 mission, joined by fellow Escargots Chawla and Doi. He flew as pilot on his second mission in 1998, the nine-day STS-95 mission that saw astronaut John H. Glenn return to space. Fellow Escargot Robinson joined Lindsey on this mission. He commanded his third spaceflight, the 13-day STS-104 mission in 2001 that delivered the Quest airlock to the space station. Fellow Escargots Kavandi and Reilly accompanied Lindsey on this flight. He served as commander of his fourth trip into space in 2006, the 13-day STS-121 second return to flight mission after the Columbia accident that also returned the station to a 3-person crew. For his fifth and final space mission in 2011, Lindsey once again served as commander, of STS-133, the 39th and final flight of space shuttle Discovery. The fifth Utilization and Logistics Flight delivered the Permanent Multipurpose Module and the third of four EXPRESS Logistics Carriers to the space station. Lindsey’s flight on STS-133 marked the last flight by a Flying Escargot. Across his five missions, Lindsey logged nearly 63 days in space. 

Born in Massachusetts, Lu earned a doctorate in applied physics. He received his first spaceflight assignment as a mission specialist on the nine-day STS-84 flight in 1997, the sixth Mir docking mission. Fellow Escargot Noriega accompanied him on the flight. On his second trip into space, Lu served as mission specialist on STS-106, a 12-day station resupply mission in 2000. He participated in a six-hour spacewalk to complete electrical connections between two of the station’s modules. Fellow Escargot Altman flew with Lu on this mission. On his third mission, Lu served as flight engineer of Expedition 7, spending 185 days in space in 2003, the only Escargot to complete a long-duration mission. He logged 206 days in space during his three spaceflights.

 

California native Melroy, a colonel in the U.S. Air Force, received her first flight assignment as pilot of STS-92, the 13-day space station assembly flight in 2000 that delivered the Z1 truss. She served as pilot on her second mission, STS-112, the 11-day flight that brought the S1 truss to the station in 2002. Fellow Escargot Ashby commanded this mission. On her third and final mission in 2007, she served as commander of STS-120, the 15-day assembly flight that brought the Harmony Node 2 module to the station. After hatch opening, space station commander Peggy A. Whitson greeted Melroy, highlighting the first time that women commanded both spacecraft. She accumulated nearly 39 days in space during her three missions. Melroy has served as NASA’s deputy administrator since June 2021. 

Noriega has the distinction as the first Peruvian-born astronaut, and served as a lieutenant colonel in the U.S. Marine Corps. For his first spaceflight, he served as a mission specialist, along with fellow Escargot Lu, on STS-84, the nine-day sixth Mir docking mission in 1997. On his second and final mission, Noriega served as a mission specialist on STS-97, the 11-day assembly flight in 2000 that delivered the P6 truss and the first set of U.S. solar arrays to the space station. He participated in three spacewalks, spending more than 19 hours outside. Fellow Escargot Bloomfield served as pilot on this mission. Across his two flights, Noriega accumulated 20 days in space. 

Born in Idaho, Reilly earned a doctorate in geosciences. He received his first spaceflight assignment as a mission specialist on STS-89, the nine-day eighth Mir docking mission in 1998. Fellow Escargots Edwards and Anderson joined him on this mission. On his second trip to space, Reilly served as a mission specialist on STS-104, the assembly flight to install the Quest airlock on the station. Reilly participated in three spacewalks, including the first one staged from the Quest airlock, totaling 15 and a half hours. Fellow Escargots Lindsey and Kavandi accompanied Reilly on this mission. On his third and final spaceflight, Reilley flew as a mission specialist on STS-117, the 14-day flight in 2007 that delivered the S3/S4 truss segment to the station. Reilly participated in two of the mission’s spacewalks, spending more than 13 hours outside. Fellow Escargot Sturckow served as commander on this mission. Across his three spaceflights, Reilly logged more than 35 days in space and spent nearly 29 hours outside on five spacewalks. 

California native Robinson earned a doctorate in mechanical engineering. On his first spaceflight, he flew, along with fellow Escargot Curbeam, as a mission specialist on STS-85, a 12-day mission in 1997 that carried the CRISTA-SPAS-2 free flyer. On his second trip into space, he served as a mission specialist on STS-95, commanded by fellow Escargot Lindsey, the nine-day mission in 1998 that saw astronaut John H. Glenn return to space. In 2005, Robinson flew for a third time on STS-114, the 14-day return to flight mission after the Columbia accident. He participated in three spacewalks totaling 20 hours. He flew as a mission specialist on STS-130, his fourth and final spaceflight, in 2010. Fellow Escargot Hire accompanied him on the 14-day mission that brought the Tranquility Node 3 module and the Cupola to the station. Robinson logged 48 days in space across his four missions. 

Born in Georgia, and a commander in the U.S. Navy, Still received her first spaceflight assignment as pilot for STS-83, the Microgravity Sciences Laboratory (MSL) mission in 1997. She has the distinction as the first of her class to reach space. When a fuel cell problem cut the planned 16-day mission short after four days, NASA decided to refly the mission and its crew. Still returned to space as pilot of STS-94, the MSL reflight, later in 1997, and flew the full duration 16 days. She logged a total of 20 days in space. 

California native and a colonel in the U.S. Marine Corps, Sturckow received his first spaceflight assignment as pilot of STS-88, the 12-day mission in 1998 that launched the Node 1 Unity module to begin assembly of the space station. He again served as pilot on his second spaceflight, STS-105 in 2001, a 12-day station assembly, resupply, and crew rotation mission. Sturckow served as commander on his third mission, the 14-day STS-117 mission in 2007 that delivered the S3/S4 truss segment to the station. Fellow Escargot Reilly accompanied Sturckow on this mission. He once again served as commander on his fourth and final spaceflight, STS-128, the 14-day flight in 2009 that brought facilities to the station to enable a six-person permanent crew. He logged more than 51 days in space on his four missions. 

Born in La Rochelle, France, Chrétien rose to the rank of brigadier general in the French Air Force. Selected as an astronaut by CNES in 1980, Chrétien made his first spaceflight in 1982, an eight-day mission aboard the Soviet Salyut-7 space station, the first non-Soviet and non-American to reach space. Chrétien returned to space in 1988, completing a 25-day mission aboard Mir during which he participated in a six-hour spacewalk, the first non-Soviet and non-American to do so. Under a special agreement between NASA and CNES, Chrétien and Tognini joined the Group 15 astronauts for training, making them eligible for flights on the shuttle. For his third and final spaceflight, Chrétien served as a mission specialist on the 11-day STS-86 seventh Mir docking mission in 1997. Fellow Escargot Bloomfield served as pilot on this mission. Across his three flights, Chrétien logged more than 43 days in space. 

Tokyo native Doi earned a doctorate in aerospace engineering. NASDA selected him as an astronaut in 1985 and through an agreement with NASA, he joined the Group 15 astronauts for training, making him eligible for flights on the space shuttle. On his first spaceflight, he flew as a mission specialist on STS-87, accompanied by fellow Escargots Lindsey and Chawla. The 16-day mission in 1997 carried the USMP-4 suite of experiments. Doi participated in two spacewalks, spending more than 15 hours outside the shuttle. For his second and final spaceflight, Doi flew as a mission specialist on STS-123, the 16-day assembly flight in 2008 that delivered the Japanese pressurized logistics module and the SPDM to the station. Fellow Escargot Gorie served as commander on this mission. Doi logged more than 31 days in space on his two missions. 

The French space agency CNES selected Tognini, born in Vincennes, France, in 1985. He rose to the rank of brigadier general in the French Air Force. He received his first assignment as Chrétien’s backup for his 1988 mission to Mir. For his first spaceflight, Tognini spent 14 days aboard Mir in 1992. Under a special agreement between NASA and CNES, Tognini and Chrétien joined the Group 15 astronauts for training, making them eligible for flights on the shuttle. For his second spaceflight, Tognini served as a mission specialist on STS-93, the five-day mission in 1999 to deploy the Chandra X-ray Observatory. Fellow Escargot Ashby served as pilot on this mission. Tognini logged nearly 19 days in space. 

Born in Saskatoon, Saskatchewan, Williams earned a medical degree. The CSA selected him as an astronaut in 1992, and in January 1995, as part of an agreement between NASA and the CSA, he joined the Group 15 astronauts for training, making him eligible for flights on the space shuttle. His first spaceflight took place in 1998 as a mission specialist on the 16-day STS-90 Neurolab mission, under the command of fellow Escargot Altman. For his second trip into space, he served as a mission specialist on STS-118, the 13-day assembly flight in 2007 that delivered the S5 truss segment to the space station. Williams participated in three of the mission’s four spacewalks, spending nearly 18 hours outside. Across his two missions, he spent nearly 29 days in space.

Summary of spaceflights by Group 15 astronauts. Jean-Loup Chrétien completed two earlier missions, to Salyut-7 in 1982 and to Mir in 1988, while Tognini completed one earlier mission to Mir in 1992.
Summary of spaceflights by Group 15 astronauts. Jean-Loup Chrétien completed two earlier missions, to Salyut-7 in 1982 and to Mir in 1988, while Tognini completed one earlier mission to Mir in 1992.
Credit: NASA

The Group 15 NASA and international astronauts made significant contributions to spaceflight. As a group, they completed 64 flights spending 888 days, or nearly two and a half years, in space, including the three flights Chrétien and Tognini completed before their addition to the group. One Flying Escargot made a single trip into space, nine made two trips, eight made three, four made four, and one went five times. Seventeen of the 23 participated in the assembly, research, maintenance, logistics, and management of the space station. In preparation for space station operations, ten group members visited Mir, and seven visited both space stations, but only one completed a long-duration flight. Twelve contributed their talents on Spacelab or other research missions, and three performed work with the great observatories Hubble and Chandra. Eight of the 23 performed 25 spacewalks spending 161 hours, or more than six days, outside their spacecraft.  

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Dominique V. Crespo

Dominique V. Crespo

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Dec 09, 2024
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      The Artemis Infrared Reflectance and Emission Spectrometer (AIRES) will identify, quantify, and map lunar minerals and volatiles, which are materials that evaporate easily, like water, ammonia, or carbon dioxide. The instrument will capture spectral data overlaid on visible light images of both specific features of interest and broad panoramas to discover the distribution of minerals and volatiles across the Moon’s south polar region. The AIRES instrument team is led by Phil Christensen from Arizona State University in Tempe.
      The Lunar Microwave Active-Passive Spectrometer (L-MAPS) will help define what is below the Moon’s surface and search for possible locations of ice. Containing both a spectrometer and a ground-penetrating radar, the instrument suite will measure temperature, density, and subsurface structures to more than 131 feet (40 meters) below the surface. The L-MAPS instrument team is led by Matthew Siegler from the University of Hawaii at Manoa.
      When combined, the data from the two instruments will paint a picture of the components of the lunar surface and subsurface to support human exploration and will uncover clues to the history of rocky worlds in our solar system. The instruments also will help scientists characterize the Moon’s resources, including what the Moon is made of, potential locations of ice, and how the Moon changes over time.
      In addition to the instruments selected for integration onto the LTV, NASA also selected the Ultra-Compact Imaging Spectrometer for the Moon (UCIS-Moon) for a future orbital flight opportunity. The instrument will provide regional context to the discoveries made from the LTV. From above, UCIS-Moon will map the Moon’s geology and volatiles and measure how human activity affects those volatiles. The spectrometer also will help identify scientifically valuable areas for astronauts to collect lunar samples, while its wide-view images provide the overall context for where these samples will be collected. The UCIS-Moon instrument will provide the Moon’s highest spatial resolution data of surface lunar water, mineral makeup, and thermophysical properties. The UCIS-Moon instrument team is led by Abigail Fraeman from NASA’s Jet Propulsion Laboratory in Southern California.
      “Together, these three scientific instruments will make significant progress in answering key questions about what minerals and volatiles are present on and under the surface of the Moon,” said Joel Kearns, deputy associate administrator for Exploration, Science Mission Directorate at NASA Headquarters. “With these instruments riding on the LTV and in orbit, we will be able to characterize the surface not only where astronauts explore, but also across the south polar region of the Moon, offering exciting opportunities for scientific discovery and exploration for years to come.”
      Leading up to these instrument selections, NASA has worked with all three lunar terrain vehicle vendors – Intuitive Machines, Lunar Outpost, and Venturi Astrolab – to complete their preliminary design reviews. This review demonstrates that the initial design of each commercial lunar rover meets all of NASA’s system requirements and shows that the correct design options have been selected, interfaces have been identified, and verification methods have been described. NASA will evaluate the task order proposals received from each LTV vendor and make a selection decision on the demonstration mission by the end of 2025. 
      Through Artemis, NASA will address high priority science questions, focusing on those that are best accomplished by on-site human explorers on and around the Moon by using robotic surface and orbiting systems. The Artemis missions will send astronauts to explore the Moon for scientific discovery, economic benefits, and build the foundation for the first crewed missions to Mars.
      To learn more about Artemis, visit:
      https://www.nasa.gov/artemis
      -end-
      Karen Fox / Molly Wasser
      Headquarters, Washington
      202-358-1600
      karen.c.fox@nasa.gov / molly.l.wasser@nasa.gov
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      Artemis Earth's Moon Science Mission Directorate View the full article
    • By NASA
      7 min read
      NASA’s Parker Solar Probe Snaps Closest-Ever Images to Sun
      KEY POINTS
      NASA’s Parker Solar Probe has taken the closest ever images to the Sun, captured just 3.8 million miles from the solar surface. The new close-up images show features in the solar wind, the constant stream of electrically charged subatomic particles released by the Sun that rage across the solar system at speeds exceeding 1 million miles an hour. These images, and other data, are helping scientists understand the mysteries of the solar wind, which is essential to understanding its effects at Earth. On its record-breaking pass by the Sun late last year, NASA’s Parker Solar Probe captured stunning new images from within the Sun’s atmosphere. These newly released images — taken closer to the Sun than we’ve ever been before — are helping scientists better understand the Sun’s influence across the solar system, including events that can affect Earth.
      “Parker Solar Probe has once again transported us into the dynamic atmosphere of our closest star,” said Nicky Fox, associate administrator, Science Mission Directorate at NASA Headquarters in Washington. “We are witnessing where space weather threats to Earth begin, with our eyes, not just with models. This new data will help us vastly improve our space weather predictions to ensure the safety of our astronauts and the protection of our technology here on Earth and throughout the solar system.”
      Parker Solar Probe started its closest approach to the Sun on Dec. 24, 2024, flying just 3.8 million miles from the solar surface. As it skimmed through the Sun’s outer atmosphere, called the corona, in the days around the perihelion, it collected data with an array of scientific instruments, including the Wide-Field Imager for Solar Probe, or WISPR. 
      Parker Solar Probe has revolutionized our understanding of the solar wind thanks to the spacecraft’s many passes through the Sun’s outer atmosphere.
      Credit: NASA’s Goddard Space Flight Center/Joy Ng The new WISPR images reveal the corona and solar wind, a constant stream of electrically charged particles from the Sun that rage across the solar system. The solar wind expands throughout of the solar system with wide-ranging effects. Together with outbursts of material and magnetic currents from the Sun, it helps generate auroras, strip planetary atmospheres, and induce electric currents that can overwhelm power grids and affect communications at Earth. Understanding the impact of solar wind starts with understanding its origins at the Sun.
      The WISPR images give scientists a closer look at what happens to the solar wind shortly after it is released from the corona. The images show the important boundary where the Sun’s magnetic field direction switches from northward to southward, called the heliospheric current sheet. It also captures the collision of multiple coronal mass ejections, or CMEs — large outbursts of charged particles that are a key driver of space weather — for the first time in high resolution.
      “In these images, we’re seeing the CMEs basically piling up on top of one another,” said Angelos Vourlidas, the WISPR instrument scientist at the Johns Hopkins Applied Physics Laboratory, which designed, built, and operates the spacecraft in Laurel, Maryland. “We’re using this to figure out how the CMEs merge together, which can be important for space weather.”
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      This video, made from images taken by Parker Solar Probe’s WISPR instrument during its record-breaking flyby of the Sun on Dec. 25, 2024, shows the solar wind racing out from the Sun’s outer atmosphere, the corona. NASA/Johns Hopkins APL/Naval Research Lab When CMEs collide, their trajectory can change, making it harder to predict where they’ll end up. Their merger can also accelerate charged particles and mix magnetic fields, which makes the CMEs’ effects potentially more dangerous to astronauts and satellites in space and technology on the ground. Parker Solar Probe’s close-up view helps scientists better prepare for such space weather effects at Earth and beyond.
      Zooming in on Solar Wind’s Origins
      The solar wind was first theorized by preeminent heliophysicist Eugene Parker in 1958. His theories about the solar wind, which were met with criticism at the time, revolutionized how we see our solar system. Prior to Parker Solar Probe’s launch in 2018, NASA and its international partners led missions like Mariner 2, Helios, Ulysses, Wind, and ACE that helped scientists understand the origins of the solar wind — but from a distance. Parker Solar Probe, named in honor of the late scientist, is filling in the gaps of our understanding much closer to the Sun.
      At Earth, the solar wind is mostly a consistent breeze, but Parker Solar Probe found it’s anything but at the Sun. When the spacecraft reached within 14.7 million miles from the Sun, it encountered zig-zagging magnetic fields — a feature known as switchbacks. Using Parker Solar Probe’s data, scientists discovered that these switchbacks, which came in clumps, were more common than expected.
      When Parker Solar Probe first crossed into the corona about 8 million miles from the Sun’s surface in 2021, it noticed the boundary of the corona was uneven and more complex than previously thought.
      As it got even closer, Parker Solar Probe helped scientists pinpoint the origin of switchbacks at patches on the visible surface of the Sun where magnetic funnels form. In 2024 scientists announced that the fast solar wind — one of two main classes of the solar wind — is in part powered by these switchbacks, adding to a 50-year-old mystery.
      However, it would take a closer view to understand the slow solar wind, which travels at just 220 miles per second, half the speed of the fast solar wind.
      “The big unknown has been: how is the solar wind generated, and how does it manage to escape the Sun’s immense gravitational pull?” said Nour Rawafi, the project scientist for Parker Solar Probe at the Johns Hopkins Applied Physics Laboratory. “Understanding this continuous flow of particles, particularly the slow solar wind, is a major challenge, especially given the diversity in the properties of these streams — but with Parker Solar Probe, we’re closer than ever to uncovering their origins and how they evolve.”
      Understanding Slow Solar Wind
      The slow solar wind, which is twice as dense and more variable than fast solar wind, is important to study because its interplay with the fast solar wind can create moderately strong solar storm conditions at Earth sometimes rivaling those from CMEs.
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      This artist’s concept shows a representative state of Earth’s magnetic bubble immersed in the slow solar wind, which averages some 180 to 300 miles per second. NASA’s Goddard Space Flight Center Conceptual Image Lab Prior to Parker Solar Probe, distant observations suggested there are actually two varieties of slow solar wind, distinguished by the orientation or variability of their magnetic fields. One type of slow solar wind, called Alfvénic, has small-scale switchbacks. The second type, called non-Alfvénic, doesn’t show these variations in its magnetic field. 
      As it spiraled closer to the Sun, Parker Solar Probe confirmed there are indeed two types. Its close-up views are also helping scientists differentiate the origins of the two types, which scientists believe are unique. The non-Alfvénic wind may come off features called helmet streamers — large loops connecting active regions where some particles can heat up enough to escape — whereas Alfvénic wind might originate near coronal holes, or dark, cool regions in the corona. 
      In its current orbit, bringing the spacecraft just 3.8 million miles from the Sun, Parker Solar Probe will continue to gather additional data during its upcoming passes through the corona to help scientists confirm the slow solar wind’s origins. The next pass comes Sept. 15, 2025.
      “We don’t have a final consensus yet, but we have a whole lot of new intriguing data,” said Adam Szabo, Parker Solar Probe mission scientist at NASA’s Goddard Space Flight Center in Greenbelt, Maryland.
      By Mara Johnson-Groh
      NASA’s Goddard Space Flight Center, Greenbelt, Md.
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      Heliophysics Goddard Space Flight Center Heliophysics Division Missions NASA Centers & Facilities NASA Directorates Parker Solar Probe (PSP) Science & Research Science Mission Directorate Solar Wind Space Weather Explore More
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    • By NASA
      6 min read
      Preparations for Next Moonwalk Simulations Underway (and Underwater)
      NASA instruments and aircraft are helping identify potential sources of critical minerals across vast swaths of California, Nevada, and other Western states. Pilots gear up to reach altitudes about twice as high as those of a cruising passenger jet.NASA NASA and the U.S. Geological Survey have been mapping the planets since Apollo. One team is searching closer to home for minerals critical to national security and the economy.
      If not for the Joshua trees, the tan hills of Cuprite, Nevada, would resemble Mars. Scalded and chemically altered by water from deep underground, the rocks here are earthly analogs for understanding ancient Martian geology. The hills are also rich with minerals. They’ve lured prospectors for more than 100 years and made Cuprite an ideal place to test NASA technology designed to map the minerals, craters, crusts, and ices of our solar system.
      Sensors that discovered lunar water, charted Saturn’s moons, even investigated ground zero in New York City were all tested and calibrated at Cuprite, said Robert Green, a senior research scientist at NASA’s Jet Propulsion Laboratory in Southern California. He’s honed instruments in Nevada for decades.
      One of Green’s latest projects is to find and map rocky surfaces in the American West that could contain minerals crucial to the nation’s economy and security. Currently, the U.S. is dependent on imports of 50 critical minerals, which include lithium and rare earth elements used in everything from rechargeable batteries to medicine.
      Scientists from the U.S. Geological Survey (USGS) are searching nationwide for domestic sources. NASA is contributing to this effort with high-altitude aircraft and sensors capable of detecting the molecular fingerprints of minerals across vast, treeless expanses in wavelengths of light not visible to human eyes.
      The hills of Cuprite, Nevada, appear pink and tan to the eye (top image) but they shine with mica, gypsum, and alunite among other types of minerals when imaged spectroscopically (lower image). NASA sensors used to study Earth and other rocky worlds have been tested there.USGS/Ray Kokaly The collaboration is called GEMx, the Geological Earth Mapping Experiment, and it’s likely the largest airborne spectroscopic survey in U.S. history. Since 2023, scientists working on GEMx have charted more than 190,000 square miles (500,000 square kilometers) of North American soil.
      Mapping Partnership Started During Apollo
      As NASA instruments fly in aircraft 60,000 feet (18,000 meters) overhead, Todd Hoefen, a geophysicist, and his colleagues from USGS work below. The samples of rock they test and collect in the field are crucial to ensuring that the airborne observations match reality on the ground and are not skewed by the intervening atmosphere.
      The GEMx mission marks the latest in a long history of partnerships between NASA and USGS. The two agencies have worked together to map rocky worlds — and keep astronauts and rovers safe — since the early days of the space race.
      For example, geologic maps of the Moon made in the early 1960s at the USGS Astrogeology Science Center in Flagstaff, Arizona, helped Apollo mission planners select safe and scientifically promising sites for the six crewed landings that occurred from 1969 to 1972. Before stepping onto the lunar surface, NASA’s Moon-bound astronauts traveled to Flagstaff to practice fieldwork with USGS geologists. A version of those Apollo boot camps continues today with astronauts and scientists involved in NASA’s Artemis mission.
      Geophysicist Raymond Kokaly, who leads the GEMx campaign for USGS, is pictured here conducting ground-based hyperspectral imaging of rock in Cuprite, Nevada, in April 2019.USGS/Todd Hoefen The GEMx mission marks the latest in a long history of partnerships between NASA and USGS. The two agencies have worked together to map rocky worlds — and keep astronauts and rovers safe — since the early days of the space race.
      Rainbows and Rocks
      To detect minerals and other compounds on the surfaces of rocky bodies across the solar system, including Earth, scientists use a technology pioneered by JPL in the 1980s called imaging spectroscopy. One of the original imaging spectrometers built by Robert Green and his team is central to the GEMx campaign in the Western U.S.
      About the size and weight of a minifridge and built to fly on planes, the instrument is called AVIRIS-Classic, short for Airborne Visible/Infrared Imaging Spectrometer. Like all imaging spectrometers, it takes advantage of the fact that every molecule reflects and absorbs light in a unique pattern, like a fingerprint. Spectrometers detect these molecular fingerprints in the light bouncing off or emitted from a sample or a surface.  
      In the case of GEMx, that’s sunlight shimmering off different kinds of rocks.  
      Compared to a standard digital camera, which “sees” three color channels (red, green, and blue), imaging spectrometers can see more than 200 channels, including infrared wavelengths of light that are invisible to the human eye.
      NASA spectrometers have orbited or flown by every major rocky body in our solar system. They’ve helped scientists investigate methane lakes on Titan, Saturn’s largest moon, and study Pluto’s thin atmosphere. One JPL-built spectrometer is currently en route to Europa, an icy moon of Jupiter, to help search for chemical ingredients necessary to support life.
      “One of the cool things about NASA is that we develop technology to look out at the solar system and beyond, but we also turn around and look back down,” said Ben Phillips, a longtime NASA program manager who led GEMx until he retired in 2025.
      The Newest Instrument
      More than 200 hours of GEMx flights are scheduled through fall 2025. Scientists will process and validate the data, with the first USGS mineral maps to follow. During these flights, an ER-2 research aircraft from NASA’s Armstrong Flight Research Center in Edwards, California, will cruise over the Western U.S. at altitudes twice as high as a passenger jet flies.
      At such high altitudes, pilot Dean Neeley must wear a spacesuit similar to those used by astronauts. He flies solo in the cramped cockpit but will be accompanied by state-of-the-art NASA instruments. In the belly of the plane rides AVIRIS-Classic, which will be retiring soon after more than three decades in service. Carefully packed in the plane’s nose is its successor: AVIRIS-5, taking flight for the first time in 2025.
      Together, the two instruments provide 10 times the performance of the older spectrometer alone, but even by itself AVIRIS-5 marks a leap forward. It can sample areas ranging from about 30 feet (10 meters) to less than a foot (30 centimeters).
      “The newest generation of AVIRIS will more than live up to the original,” Green said.
      More About GEMx
      The GEMx research project will last four years and is funded by the USGS Earth Mapping Resources Initiative. The initiative will capitalize on both the technology developed by NASA for spectroscopic imaging, as well as the agency’s expertise in analyzing the datasets and extracting critical mineral information from them.
      Data collected by GEMx is available here.
      News Media Contacts
      Andrew Wang / Jane J. Lee
      Jet Propulsion Laboratory, Pasadena, Calif.
      626-379-6874 / 818-354-0307
      andrew.wang@jpl.nasa.gov / jane.j.lee@jpl.nasa.gov
      Karen Fox / Elizabeth Vlock
      NASA Headquarters, Washington
      202-358-1600
      karen.c.fox@nasa.gov / elizabeth.a.vlock@nasa.gov
      Written by Sally Younger
      2025-086
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      Last Updated Jul 10, 2025 Related Terms
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