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60_days_in_bed_for_science_card_full.png Video: 00:06:40

A group of volunteers is spending two months lying in bed—with their feet up and one shoulder always touching the mattress—even while eating, showering, and using the toilet. But why? This extreme bedrest study is helping scientists understand how space travel affects the human body and how to keep astronauts healthy on long missions.

Microgravity causes muscle and bone loss, fluid shifts, and other physiological changes similar to those experienced by bedridden patients on Earth. By studying volunteers here on Earth, researchers can develop better countermeasures for astronauts and even improve treatments for medical conditions like osteoporosis.

In this study, participants are divided into three groups: one stays in bed with no exercise, another cycles in bed to mimic astronaut workouts, and a third cycles while being spun in a centrifuge to simulate artificial gravity. Scientists hope artificial gravity could become a key tool in protecting astronauts during deep-space missions.

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    • By NASA
      Explore This Section Earth Home Earth Observer Home Editor’s Corner Feature Articles Meeting Summaries News Science in the News Calendars In Memoriam More Archives 13 min read
      The NASA DC-8 Retires: Reflections on its Contributions to Earth System Science
      Introduction
      Since 1987, a highly modified McDonnell Douglas DC-8 aircraft has been a workhorse in NASA’s Airborne Science Program (ASP)—see Photo 1. The aircraft, located at NASA’s Armstrong Flight Research Center (AFRC) in California, flew countless missions as a science laboratory, producing science data that supports projects serving the world’s scientific community, particularly the NASA Earth science community. NASA recently decided to retire the venerable DC-8 aircraft, which made its last science flight in April 2024. The DC-8 is being replaced with a similarly refurbished Boeing 777 aircraft, which will be even more capable than the DC-8.
      Photo 1. NASA’s DC-8 flying laboratory flew Earth science missions for NASA’s. Airborne Science Program (ASP) from 1987–2024. The versatile aircraft was used to conduct a variety of research experiments that spanned all seven continents. Photo credit: Lori Losey [NASA’s Armstrong Flight Research Center (AFRC)] More information is available about the full history of ASP, its primary objectives, and its many achievements in an archived article: see “Flying in the ‘Gap’ Between Earth and Space: NASA’s Airborne Science Program” [The Earth Observer, September–October 2020, 32:5, 4–14].
      Workshop Overview
      The NASA History Office and NASA Earth Science Division cohosted a workshop, titled “Contributions of the DC-8 to Earth System Science at NASA,” on October 24–25, 2024 at the Mary W. Jackson NASA Headquarters (HQ) Building in Washington, DC – see Photo 2.
      The agenda included not just the DC-8’s contributions to Earth Science at NASA, but also its role supporting the Aeronautics Research Mission Directorate and work in space science. Many DC-8 veterans – including several who are now retired – attended the event in person or online. The program consisted of six panels and roundtables, each calling attention to a unique aspect of the DC-8 story.
      Photo 2. Group photo of the in person and remote participants of the workshop on “Contributions of the DC-8 to Earth System Science at NASA,” which took place October 24–25, 2024 at the Mary W. Jackson NASA Headquarters (HQ) Building in Washington, DC. Photo credit: Rafael Luis Méndez Peña [NASA’s Ames Research Center, Earth Science Program Office] The event featured 38 individuals (speakers, panelists, and moderators) from NASA HQ, five NASA centers, eight universities, the Search for Extraterrestrial Intelligence Institute, and the National Oceanic and Atmospheric Administration. In addition, Spanish filmmaker Rafael Luis Méndez Peña debuted a trailer for his documentary film, NASA-817, on October 24 and took photographs during the workshop. The ??? agenda a workshop recording ???, and other related materials are available through the NASA History Office.
      The Tale of the NASA DC-8
      The article follows the outline of the workshop that places the DC-8 in the context of the overall history of NASA aircraft observations, science campaigns, community, and international collaboration, education and outreach activities.
      A History in Context: the DC-8 and NASA’s Airborne Science Program
      NASA’s involvement in airborne science extends to the agency’s inception. The National Aeronautics and Space Act of 1958 states that NASA’s first objective shall be “the expansion of human knowledge of phenomena in the atmosphere and space.” Subsequent legislation expanded NASA’s role in atmospheric and Earth system science. To fulfill this objective, NASA maintains a fleet of airborne platforms through ASP – see Figure –to study the environment, develop new technologies, verify satellite data, and monitor space vehicle activity.
      Figure. The DC-8 was but one aircraft is NASA’s sizeable Airborne Science Fleet – which is maintained and operated by ASP. Note that in addition to a variety of piloted aircraft operating at different altitudes shown in this drawing, NASA also operates uncrewed aircraft systems and even uses kites to conduct Earth observations. Figure credit: NASA Science Suborbital Platforms, NASA’s Goddard Space Flight Center, Science Support Office NASA operated two large flying laboratories prior to the DC-8 Airborne Science Laboratory. Both aircraft were converted Convair (CV) 990s. Regrettably, both aircraft succumbed to catastrophic accidents. The first, known as Galileo, collided with a U.S. Navy P-3 Orion near Moffett Field, CA, in April 1973, killing 11 NASA personnel. Its replacement, Galileo II, crashed on takeoff at March Air Force Base in July 1985. While there were no fatalities in the second accident, the ensuing fire consumed the aircraft and its instruments. The loss of Galileo II left a gaping hole in NASA’s ability to conduct essential scientific and engineering research.
      In January 1986, after months of bureaucratic scrambling, NASA finalized the purchase of former commercial airliner (DC-8-72) for $24 million, which included costs to modify the aircraft to carry a science payload and crew. The modified DC-8 Airborne Science Laboratory—shown in Photo 2— arrived at NASA Ames Research Center during the Summer of 1987.
      Overview Presentations on Airborne Science
      Jack Kaye [NASA Headquarters—Associate Director for Research of the Earth Science Division] gave the meeting’s opening remarks, where he placed the DC-8’s activities in a larger perspective. He noted that one of the features that makes airborne science so unique at NASA is the combination of platforms, sensors, systems, people, and opportunities. The DC-8 was able to carry a large number of people as well as instruments to carry out long-range operations under diverse conditions.
      “[The DC-8 offered] a really versatile, flexible platform that’s allowed for lots of science,” said Kaye.
      Later in the meeting, Karen St. Germain [NASA Headquarters—Director of the Earth Science Division] built upon Kaye’s comments. She noted that while NASA’s satellite missions receive most of the public’s attention, airborne science is an essential part of the NASA mission.
      “This is the grassroots of science,” she stressed. “It’s where a lot of the great ideas are born. It’s where a lot of the fledgling sensor technologies are demonstrated.”
      First Flight for the DC-8
      NASA routinely conducts field campaigns – where ground observations are timed and coordinated with aircraft flights (often at more than one altitude) and with satellite overpasses to gain a comprehensive (multilayered, multiscale) picture of the atmosphere over a certain area. A more detailed account of two NASA field campaigns from the 1980s and 1990s, and their follow-up missions, is available in an archived article: see “Reflections on FIFE and BOREAS: Historical Perspective and Meeting Summary” [The Earth Observer, January–February 2017, 29:1, 6–23]. The article illustrates scaled observations as they were conducted during FIFE and BOREAS.
      Researchers first used the DC-8 Airborne Science Laboratory on a high-profile interagency field campaign – Antarctic Airborne Ozone Expedition (AAOE), the first airborne experiment to study the chemistry and dynamics of the Antarctic ozone hole. The scientific data collected during AAOE produced unequivocable evidence that human-made chemicals were involved in the destruction of ozone over the Antarctic. This data served as a major impetus toward the enactment of amendments to the Montreal Protocol, which banned the manufacture of chlorofluorocarbons.
      Estelle Condon [NASA’s Ames Research Center (ARC), emeritus] was a program manager for AAOE. During the meeting, she shared her memories of the hectic days leading up to the DC-8’s first mission.
      “There was an enormous task in front of [the aircraft team] – just a huge task – to get all the relay racks, all the wiring, all the ports for the windows designed and built so that when the scientists finally came, all that instrumentation could actually be put on the aircraft,” said Condon. She added that the ARC staff worked day and night and every weekend to make the plane ready.
      “It’s a miracle that they were able to put everything together and get it to the tip of South America in time for the mission,” she said.
      Other Noteworthy Field Campaigns Involving the DC-8
      The DC-8 would go on to be used in many other field campaigns throughout its 37-year history
      and was central to several of NASA’s research disciplines. For example, Michael Kurylo [NASA Headquarters—Atmospheric Composition Program Scientist] was the manager of NASA’s Upper Atmosphere Research Program, where he developed, promoted, and implemented an extramural research program in stratospheric and upper tropospheric composition and directed its advanced planning at a national and international level. Kurylo summarized the DC-8’s many flights to study stratospheric chemistry beyond the AAOE missions.
      Kurylo also discussed the DC-8’s role in tropospheric chemistry investigations, especially through the many field campaigns that were conducted as part of the Global Troposphere Experiment (GTE). He also touched on the culture of NASA airborne science and the dynamic that existed between scientists and those who operated and maintained the aircraft.  “The scientists were always referred to [by NASA pilots and groundcrew] as ‘coneheads’…. Too much college, not enough high school,” Kurylo explained. But he and his colleagues have such fond memories of their time spent working together onboard the DC-8. 
      James Crawford [NASA’s Langley Research Center], a project scientist for many of the GTE campaigns, explained that from 1983–2001 16 GTE aircraft-based missions, each with its own name and location, took place. Each mission collected a rich set of data records of atmospheric observations and on many occasions the data were used as baselines for subsequent campaigns. The DC-8 was one of several NASA aircraft involved, the others being the Corvair-990, Electra, and P-3B.
      Joshua Schwarz [NOAA’s Chemical Sciencc Laboratory] discussed the airplane’s role in global atmospheric monitoring.  He recall thinking, after his first experience with the DC-8 that this flying airborne laboratory, “…was going to make things possible that wouldn’t otherwise be possible,” Schwarz concluded after his first encounter with the DC-8.
      Other workshop participants went on to describe how – for nearly four decades – investigators used data collected by instruments on the DC-8 to conduct research and write papers on important scientific and engineering topics.
      The People Behind the Aircraft: The DC-8 Community
      The DC-8 was a large and durable aircraft capable of long-range flights, which made it ideal for conducting scientific research. Around these research efforts a strong community emerged. Over three decades, the DC-8 accommodated many investigators from NASA, interagency offices, U.S. universities, and international organizations on extended global missions. Agency officials also moved the DC-8 base of operations several times between 1986 and 2024, thereby demanding tremendous cross-center cooperation.
      “Looking around the room, it’s clear that what brought us together [for the workshop] is more than just an aircraft,” said Nickelle Reid [NASA’s Armstrong Flight Research Center]. “It’s been a shared commitment, decades of passion and dedication from scientists, yes, but also mechanics, technicians, integration engineers, project managers, mission planners, operations engineers, flight engineers, mission directors, mission managers, logistics technicians and, of course, pilots. This village of people has been the beating heart of the DC-8 program.”
      This DC-8 community was well represented at this workshop and played a key role in its success.
      The DC-8 as a Means of International Engagement
      The DC-8 community expanded beyond the U.S., opening unique opportunities for international engagement. The campaigns of the DC-8 Airborne Science Laboratory routinely involved foreign students, institutions, and governments. For example, the Korea–U.S. Air Quality (KORUS-AQ) campaign, an international cooperative air quality field study in Korea, took place in 2016. For more information about this campaign, see the archived Earth Observer article, “Flying in the ‘Gap’ Between Earth and Space: NASA’s Airborne Science Program” [The Earth Observer, September–October 2022, 32:5, 4–14].
      Yunling Lou [NASA/Jet Propulsion Laboratory] spoke to the workshop audience about the value of international collaboration.
      “I think [international collaboration] really helped – not just doing the collaboration [to accomplish a specific mission] but doing the training, the capacity building in these countries to build the community of global scientists and engineers,” said Lou.
      Trina Dryal [LaRC—Deputy Director] continued that the DC-8 and NASA’s other airborne assets are more than just science laboratories.
      “[They] are opportunities for science, diplomacy, international collaboration, cross learning, educational inspiration, and goodwill,” said Dryal—see Photo 3.
      Photo 3. International collaborations included educational endeavors.  Here, Walter Klein [AFRC—DC-8 Mission Manager] poses with a group of Chilean students onboard the DC-8 Airborne Science Laboratory in Punta Arenas, Chile, March 2004. Photo credit: Jim Closs [NASA’s Langley Research Center] Student Investigations on the DC-8
      Closer to home, the flying scientific laboratory affected the lives of many U.S. students and early career professionals. NASA’s Student Airborne Research Program (SARP), is an eight-week summer internship for rising-senior undergraduates that takes place annually on the East and West coasts of the U.S – see Photo 4. During the program, students gain hands-on experience conducting all aspects of a scientific campaign. They conduct field research, analyze the data, and gain access to one or more of NASA’s ASP flying science laboratories.  Since 2009, this program alone has provided hands on experience in conducting NASA Earth science research to XXXX students.
      Berry Lefer [NASA Headquarters—Tropospheric Composition Program Manager] pointed out that SARP helped to integrate American students into DC-8 scientific missions.
      “I want to make sure the NASA historians understand that the DC-8 is the premier flying laboratory on the planet, bar none,” said Lefer. “You’ve seen over the whole three-decade life of the DC-8 that education and outreach, student involvement has been a hallmark of the DC-8 [program].”
      Yaitza Luna-Cruz [NASA Headquarters—Program Executive] was one among several SARP alumni who delivered testimony on the impact of the SARP program at the workshop.
      “SARP unleashed my potential in ways that I cannot even describe,” said Luna-Cruz. “You never know what a single opportunity could do to shape the career of a student or early career researcher.
      Luna-Cruz hopes these efforts continue with the coming of NASA’s new Boeing 777 airborne laboratory.
      Photo 4. One of the most popular student investigations flown on the DC-8 (and other ASP aircraft) was (is) the Student Airborne Research Program (SARP), in which upper-level undergraduate students can gain valuable hands-on experience conducting field research.  Students taking part in SARP and their mentors posed with the DC-8 at AFRC in 2019 [top] and in 2022 [bottom]. The 2022 SARP group flew flights over California’s Central Valley to study air quality. Photo credit: [Top] NASA; [bottom] Lauren Hughes [ARC] Final Flight and Retirement of the DC-8
      The DC-8 Airborne Science Laboratory flew its last science flight during the international Airborne and Satellite Investigation of Asian Air Quality mission (ASIA-AQ) in April 2024. Since its final flight, the aircraft has been retired to Idaho State University (ISU). Today, students in ISU’s aircraft maintenance program work on the airplane to develop real-world technical skills – continuing the DC-8’s mission as an educational platform. According to Gerald Anhorn [ISU—Dean of College of Technology], ISU students have a unique opportuning to gain experience working on a legendary research aircraft.
      “Our students have that opportunity because of [NASA’s] donation” to the school, said Auborn.
      Conclusion: Flying Toward the Future – From DC-8 to Boeing 777
      While the DC-8 is retiring from active service, airborne observations continue to be a vital part of NASA’s mission. The agency recently acquired a Boeing 777and will modify it to support its ongoing airborne scientific research efforts. This new addition expands beyond the capacity of the DC-8 by allowing for even longer flights with larger payloads and more researchers to gather data. Several members of the Boeing 777 team from NASA’s Langley Research Center (LaRC) attended the workshop.
       “I mentioned I was in charge of the ‘replacement’ for the DC-8,” said Martin Nowicki [LaRC—Boeing 777 Lead]. “Over the last two days, here, it’s become pretty apparent that there’s no ‘replacing’ the DC-8. It’s carved out its own place in history. It’s just done so much.”
      Nowicki looks forward to working with workshop participants to identify useful lessons of the past for future operators. He concluded that the Boeing 777 will carry the legacy of the DC-8 and continue with capturing the amazing science of ASP.
      Acknowledgments
      The authors wish to thank Jack Kaye [NASA HQ—Associate Director of Research for the Earth Science Division] for his helpful reviews of the article draft.  The first author also wishes to thank Lisa Frazier [NASA Headquarters—Strategic Events and Engagement Lead] for providing support and assistance throughout for the in-person workshop participants. and to the Earth Science Project Office team from NASA’s Ames Research Center, who performed essential conference tasks, such as website construction, audio-visual support, and food service management. This article is an enhanced version of the first author’s summary, which appeared in the Spring 2025 issue of News & Notes – The NASA History Office’s newsletter.
      Bradley L. Coleman
      NASA’s Marshall Space Flight Center, NASA History Office
      bradley.l.coleman@nasa.gov
      Alan B. Ward
      NASA’s Goddard Space Flight Center/Global Science & Technology Inc.
      alan.b.ward@nasa.gov
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      Last Updated Mar 11, 2025 Related Terms
      Earth Science View the full article
    • By European Space Agency
      Help us uncover the secrets of the Sun! Our Solar Orbiter spacecraft has been watching the Sun since February 2020. With five years’ worth of data waiting to be explored, it’s time to dig in. The new ‘Solar Radio Burst Tracker’ Zooniverse project is ready for you.
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    • By NASA
      The NASA Ames Science Directorate recognizes the outstanding contributions of (pictured left to right) Jessica Kong, Josh Alwood, and Sam Kim. Their commitment to the NASA mission represents the entrepreneurial spirit, technical expertise, and collaborative disposition needed to explore this world and beyond.
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      Jessica Kong is serving as the Facility Service Manager (FSM) for the Astrobiology and Life Science Lab building for the Exobiology Branch while the FSM is away on parental leave. She has applied her expertise as a chemist to connect seamlessly and effectively with N239 staff, and safety, and facility personnel, as well as to coordinate repairs and building shutdowns while minimizing disruption to laboratory research.

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      Earth Science Star: Sam Kim
      Sam Kim, a systems administrator and deputy project manager with the Earth Science Project Office (ESPO), serves many roles and excels in each one of them. During the 2024 ASIA-AQ field mission, Sam deployed for over two months as a key member of the advanced staging team at each of the mission’s four overseas field sites, ensuring that the facilities were ready for the arrival of the ASIA-AQ science and instrument team, while still performing his mission-critical role as systems administrator.
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    • By NASA
      Tess Caswell, a stand-in crew member for the Artemis III Virtual Reality Mini-Simulation, executes a moonwalk in the Prototype Immersive Technology (PIT) lab at NASA’s Johnson Space Center in Houston. The simulation was a test of using VR as a training method for flight controllers and science teams’ collaboration on science-focused traverses on the lunar surface. Credit: NASA/Robert Markowitz When astronauts walk on the Moon, they’ll serve as the eyes, hands, and boots-on-the-ground interpreters supporting the broader teams of scientists on Earth. NASA is leveraging virtual reality to provide high-fidelity, cost-effective support to prepare crew members, flight control teams, and science teams for a return to the Moon through its Artemis campaign.
      The Artemis III Geology Team, led by principal investigator Dr. Brett Denevi of the Johns Hopkins University Applied Physics Laboratory in Laurel, Maryland, participated in an Artemis III Surface Extra-Vehicular VR Mini-Simulation, or “sim” at NASA’s Johnson Space Center in Houston in the fall of 2024. The sim brought together science teams and flight directors and controllers from Mission Control to carry out science-focused moonwalks and test the way the teams communicate with each other and the astronauts.
      “There are two worlds colliding,” said Dr. Matthew Miller, co-lead for the simulation and exploration engineer, Amentum/JETSII contract with NASA. “There is the operational world and the scientific world, and they are becoming one.”
      NASA mission training can include field tests covering areas from navigation and communication to astronaut physical and psychological workloads. Many of these tests take place in remote locations and can require up to a year to plan and large teams to execute. VR may provide an additional option for training that can be planned and executed more quickly to keep up with the demands of preparing to land on the Moon in an environment where time, budgets, and travel resources are limited.
      VR helps us break down some of those limitations and allows us to do more immersive, high-fidelity training without having to go into the field. It provides us with a lot of different, and significantly more, training opportunities.
      BRI SPARKS
      NASA co-lead for the simulation and Extra Vehicular Activity Extended Reality team at Johnson.
      Field testing won’t be going away. Nothing can fully replace the experience crew members gain by being in an environment that puts literal rocks in their hands and incudes the physical challenges that come with moonwalks, but VR has competitive advantages.
      The virtual environment used in the Artemis III VR Mini-Sim was built using actual lunar surface data from one of the Artemis III candidate regions. This allowed the science team to focus on Artemis III science objectives and traverse planning directly applicable to the Moon. Eddie Paddock, engineering VR technical discipline lead at NASA Johnson, and his team used data from NASA’s Lunar Reconnaissance Orbiter and planet position and velocity over time to develop a virtual software representation of a site within the Nobile Rim 1 region near the south pole of the Moon. Two stand-in crew members performed moonwalk traverses in virtual reality in the Prototype Immersive Technology lab at Johnson, and streamed suit-mounted virtual video camera views, hand-held virtual camera imagery, and audio to another location where flight controllers and science support teams simulated ground communications.
      A screen capture of a virtual reality view during the Artemis III VR Mini-Simulation. The lunar surface virtual environment was built using actual lunar surface data from one of the Artemis III candidate regions. Credit: Prototype Immersive Technology lab at NASA’s Johnson Space Center in Houston. The crew stand-ins were immersed in the lunar environment and could then share the experience with the science and flight control teams. That quick and direct feedback could prove critical to the science and flight control teams as they work to build cohesive teams despite very different approaches to their work.
      The flight operations team and the science team are learning how to work together and speak a shared language. Both teams are pivotal parts of the overall mission operations. The flight control team focuses on maintaining crew and vehicle safety and minimizing risk as much as possible. The science team, as Miller explains, is “relentlessly thirsty” for as much science as possible. Training sessions like this simulation allow the teams to hone their relationships and processes.
      Members of the Artemis III Geology Team and science support team work in a mock Science Evaluation Room during the Artemis III Virtual Reality Mini-Simulation at NASA’s Johnson Space Center in Houston. Video feeds from the stand-in crew members’ VR headsets allow the science team to follow, assess, and direct moonwalks and science activities. Credit: NASA/Robert Markowitz Denevi described the flight control team as a “well-oiled machine” and praised their dedication to getting it right for the science team. Many members of the flight control team have participated in field and classroom training to learn more about geology and better understand the science objectives for Artemis.
      “They have invested a lot of their own effort into understanding the science background and science objectives, and the science team really appreciates that and wants to make sure they are also learning to operate in the best way we can to support the flight control team, because there’s a lot for us to learn as well,” Denevi said. “It’s a joy to get to share the science with them and have them be excited to help us implement it all.”
      Artemis III Geology Team lead Dr. Brett Denevi of the Johns Hopkins University Applied Physics Laboratory in Laurel, Maryland, left, Artemis III Geology Team member, Dr. Jose Hurtado, University of Texas at El Paso, and simulation co-lead, Bri Sparks, work together during the Artemis III Virtual Reality Mini-Simulation at NASA’s Johnson Space Center in Houston. Credit: NASA/Robert Markowitz This simulation, Sparks said, was just the beginning for how virtual reality could supplement training opportunities for Artemis science. In the future, using mixed reality could help take the experience to the next level, allowing crew members to be fully immersed in the virtual environment while interacting with real objects they can hold in their hands. Now that the Nobile Rim 1 landing site is built in VR, it can continue to be improved and used for crew training, something that Sparks said can’t be done with field training on Earth.
      While “virtual” was part of the title for this exercise, its applications are very real.
      “We are uncovering a lot of things that people probably had in the back of their head as something we’d need to deal with in the future,” Miller said. “But guess what? The future is now. This is now.”
      Test subject crew members for the Artemis III Virtual Reality Mini-Simulation, including Grier Wilt, left, and Tess Caswell, center, execute a moonwalk in the Prototype Immersive Technology lab at NASA’s Johnson Space Center in Houston. Credit: NASA/Robert Markowitz Grier Wilt, left, and Tess Caswell, crew stand-ins for the Artemis III Virtual Reality Mini-Simulation, execute a moonwalk in the Prototype Immersive Technology (PIT) lab at NASA’s Johnson Space Center in Houston. Credit: NASA/Robert Markowitz Engineering VR technical discipline lead Eddie Paddock works with team members to facilitate the virtual reality components of the Artemis III Virtual Reality Mini-Simulation in the Prototype Immersive Technology lab at NASA’s Johnson Space Center in Houston. Credit: Robert Markowitz Flight director Paul Konyha follows moonwalk activities during the Artemis III Virtual Reality Mini-Simulation at NASA’s Johnson Space Center in Houston. Credit: NASA/Robert Markowitz




      Rachel Barry
      NASA’s Johnson Space Center
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