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By NASA
Space changes you. It strengthens some muscles, weakens others, shifts fluids within your body, and realigns your sense of balance. NASA’s Human Research Program works to understand—and sometimes even counter—those changes so astronauts can thrive on future deep space missions.
NASA astronaut Loral O’Hara pedals on the Cycle Ergometer Vibration Isolation System (CEVIS) inside the International Space Station’s Destiny laboratory module.NASA Astronauts aboard the International Space Station work out roughly two hours a day to protect bone density, muscle strength and the cardiovascular system, but the longer they are in microgravity, the harder it can be for the brain and body to readapt to gravity’s pull. After months in orbit, returning astronauts often describe Earth as heavy, loud, and strangely still. Some reacclimate within days, while other astronauts take longer to fully recover.
Adjusting to Gravity
NASA’s SpaceX Crew-7 astronaut Jasmin Moghbeli after landing in the Gulf of America on March 12, 2024, completing 197 days in space.NASA/Joel Kowsky The crew of NASA’s SpaceX Crew-7 mission— NASA astronaut Jasmin Moghbeli, ESA (European Space Agency) astronaut Andreas Mogensen, JAXA (Japan Aerospace Exploration Agency) astronaut Satoshi Furukawa, and Roscosmos cosmonaut Konstantin Borisov—landed in March 2024 after nearly 200 days in space. One of the first tests volunteer crew members completed was walking with their eyes open and then closed.
“With eyes closed, it was almost impossible to walk in a straight line,” Mogensen said. In space, vision is the primary way astronauts orient themselves, but back on Earth, the brain must relearn how to use inner-ear balance signals. Moghbeli joked her first attempt at the exercise looked like “a nice tap dance.”
“I felt very wobbly for the first two days,” Moghbeli said. “My neck was very tired from holding up my head.” She added that, overall, her body readapted to gravity quickly.
Astronauts each recover on their own timetable and may encounter different challenges. Mogensen said his coordination took time to return. Furukawa noted that he could not look down without feeling nauseated. “Day by day, I recovered and got more stable,” he said.
NASA astronaut Loral O’Hara after landing in a remote area near the town of Zhezkazgan, Kazakhstan, on April 6, 2024.NASA/Bill Ingalls NASA astronaut Loral O’Hara returned in April 2024 after 204 days in space. She said she felt almost completely back to normal a week after returning to Earth. O’Hara added that her prior experience as an ocean engineer gave her insight into space missions. “Having those small teams in the field working with a team somewhere else back on shore with more resources is a good analog for the space station and all the missions we’re hoping to do in the future,” she said.
NASA astronaut Nichole Ayers, who flew her first space mission with NASA’s SpaceX Crew-10, noted that the brain quickly adapts to weightlessness by tuning out the vestibular system, which controls balance. “Then, within days of being back on Earth, it remembers again—it’s amazing how fast the body readjusts,” she said.
Expedition 69 NASA astronaut Frank Rubio outside the Soyuz MS-23 spacecraft after landing near the town of Zhezkazgan, Kazakhstan, on Sept. 27, 2023. NASA/Bill Ingalls When NASA astronaut Frank Rubio landed in Kazakhstan in September 2023, he had just completed a record 371-day mission—the longest single U.S. spaceflight.
Rubio said his body adjusted to gravity right away, though his feet and lower back were sore after more than a year without weight on them. Thanks to consistent workouts, Rubio said he felt mostly recovered within a couple of weeks.
Mentally, extending his mission from six months to a year was a challenge. “It was a mixed emotional roller coaster,” he said, but regular video calls with family kept him grounded. “It was almost overwhelming how much love and support we received.”
Crew-8 astronauts Matt Dominick, Jeanette Epps, Michael Barratt, and cosmonaut Alexander Grebenkin splashed down in October 2024 after 235 days on station. Dominick found sitting on hard surfaces uncomfortable at first. Epps felt the heaviness of Earth immediately. “You have to move and exercise every day, regardless of how exhausted you feel,” she said.
Barratt, veteran astronaut and board certified in internal and aerospace medicine, explained that recovery differs for each crew member, and that every return teaches NASA something new.
Still a Challenge, Even for Space Veterans
NASA astronaut Suni Williams is helped out of a SpaceX Dragon spacecraft aboard the SpaceX recovery ship after splashing down off the coast of Tallahassee, Florida, March 18, 2025. NASA/Keegan Barber Veteran NASA astronauts Suni Williams and Butch Wilmore returned from a nine-month mission with Crew-9 in early 2025. Despite her extensive spaceflight experience, Williams said re-adapting to gravity can still be tough. “The weight and heaviness of things is surprising,” she said. Like others, she pushed herself to move daily to regain strength and balance.
NASA astronaut Don Pettit arrives at Ellington Field in Houston on April 20, 2025, after returning to Earth aboard the Soyuz MS-25 spacecraft. NASA/Robert Markowitz NASA astronaut Don Pettit, also a veteran flyer, came home in April 2025 after 220 days on the space station. At 70 years old, he is NASA’s oldest active astronaut—but experience did not make gravity gentler. During landing, he says he was kept busy, “emptying the contents of my stomach onto the steppes of Kazakhstan.” Microgravity had eased the aches in his joints and muscles, but Earth’s pull brought them back all at once.
Pettit said his recovery felt similar to earlier missions. “I still feel like a little kid inside,” he said. The hardest part, he explained, isn’t regaining strength in big muscle groups, but retraining the small, often-overlooked muscles unused in space. “It’s a learning process to get used to gravity again.”
Recovery happens day by day—with help from exercise, support systems, and a little humor. No matter how long an astronaut is in space, every journey back to Earth is unique.
The Human Research Program help scientists understand how spaceflight environments affect astronaut health and performance and informs strategies to keep crews healthy for future missions to the Moon, Mars, and beyond. The program studies astronauts before, during, and after spaceflight to learn how the human body adapts to living and working in space. It also collects data through Earth-based analog missions that can help keep astronauts safer for future space exploration.
To learn more about how microgravity affects the human body and develop new ways to help astronauts stay healthy, for example, its scientists conduct bedrest studies – asking dozens of volunteers to spend 60 days in bed with their heads tilted down at a specific angle. Lying in this position tricks the body into responding as it would if the body was in space which allows scientists to trial interventions to hopefully counter some of microgravity’s effects. Such studies, through led by NASA, occur at the German Aerospace Center’s Cologne campus at a facility called :envihab – a combination of “environment” and “habitat.”
Additional Earth-based insights come from the Crew Health and Performance Exploration Analog (CHAPEA) and the Human Exploration Research Analog (HERA) at NASA’s Johnson Space Center in Houston. Both analogs recreate the remote conditions and scenarios of deep space exploration here on Earth with volunteer crews who agree to live and work in the isolation of ground-based habitats and endure challenges like delayed communication that simulates the type of interactions that will occur during deep space journeys to and from Mars. Findings from these ground-based missions and others will help NASA refine its future interventions, strategies, and protocols for astronauts in space.
NASA and its partners have supported humans continuously living and working in space since November 2000. After nearly 25 years of continuous human presence, the space station remains the sole space-based proving ground for training and research for deep space missions, enabling NASA’s Artemis campaign, lunar exploration, and future Mars missions.
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By NASA
A child of the Space Shuttle Program, Jeni Morrison grew up walking the grounds of NASA’s Johnson Space Center in Houston with her parents and listening to family stories about human spaceflight.
Now, with more than 15 years at NASA, Morrison serves as one of Johnson’s Environmental Programs managers. She ensures the center complies with laws that protect its resources by overseeing regulatory compliance for cultural and natural resources, stormwater and drinking water programs, and the National Environmental Policy Act. She also safeguards Johnson’s historic legacy as Johnson’s Cultural Resources manager.
Jeni Morrison in the mall area at NASA’s Johnson Space Center in Houston, where employees often see local wildlife, including turtles, birds, deer, and the occasional alligator. “I make sure our actions comply with the National Historic Preservation act, since the center is considered a historic district with two National Historic Landmarks onsite,” Morrison said. “I make sure we respect and document Johnson’s heritage while paving the way for new efforts and mission objectives.”
Morrison takes pride in finding solutions that increase efficiency while protecting resources. One example was a project with Johnson’s Geographic Information System team to create an interactive material and chemical spill plan map. The new system helps responders quickly trace spill paths above and underground to deploy resources faster, reducing cleanup costs and minimizing environmental impacts.
“Every improvement we make not only saves time and resources, but strengthens our ability to support NASA’s mission,” she said.
By the very nature of our work, NASA makes history all the time. That history is important for all people, both to remember the sacrifices and accomplishments of so many, but also to ensure we don’t repeat mistakes as we strive for even bolder achievements.
Jeni Morrison
Environmental Program Manager
Jeni Morrison presents an overview of environmental compliance and center initiatives to employees at NASA’s Johnson Space Center in 2014. NASA/Lauren Harnett For Morrison, success often comes down to teamwork. She has learned to adapt her style to colleagues’ needs to strengthen collaboration.
“By making the effort to accommodate others’ communication styles and learn from different perspectives, we create better, more efficient work,” she said. “Thankfully, so many people here at NASA are willing to teach and to share their experiences.”
Her message to the Artemis Generation is simple: Always keep learning!
“You never know when a side conversation could give you an answer to a problem you are facing down the line,” she said. “You must be willing to ask questions and learn something new to find those connections.”
Jeni Morrison (second from right) with the Biobased Coolant Project Team at NASA’s Johnson Space Center in 2018. The team tested biobased metalworking coolants and identified a product that outperformed petroleum-based options, meeting flight hardware specifications while reducing waste disposal costs and labor hours. Even as a young child visiting NASA Johnson, I could feel the sense of adventure, accomplishment, and the drive to reach new heights of human capability. I realize that those experiences gave me a fascination with learning and an inherent need to find ways to do things better.
jENI mORRISON
Environmental Program Manager
Her passion for learning and discovery connects to a family tradition at NASA. Her grandfather contributed to multiple Apollo missions, including helping solve the oxygen tank malfunction on Apollo 13. Her mother worked at the center transcribing astronaut recordings and writing proposals, and her father flew experiments aboard the space shuttle and International Space Station. Morrison’s sister and extended family also worked at Johnson.
Now her son is growing up on the center grounds while attending the JSC Child Care Center. “As the fourth generation to be at Johnson, he is already talking about how he loves science and can’t wait to do his own experiments,” she said.
For Morrison, carrying that family legacy forward through environmental stewardship is a privilege. “Being able to contribute to NASA’s mission through environmental compliance feels like the best of both worlds for me,” Morrison said. “It combines my love of science and NASA with my drive to find more efficient ways to operate while protecting this incredible site and everything it represents.”
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By Amazing Space
BLOOD MOON TONIGHT! Total Lunar Eclipse September 7, 2025 + 5 Amazing Moon Features You Can See!
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By NASA
Explore Hubble Hubble Home Overview About Hubble The History of Hubble Hubble Timeline Why Have a Telescope in Space? Hubble by the Numbers At the Museum FAQs Impact & Benefits Hubble’s Impact & Benefits Science Impacts Cultural Impact Technology Benefits Impact on Human Spaceflight Astro Community Impacts Science Hubble Science Science Themes Science Highlights Science Behind Discoveries Universe Uncovered Hubble’s Partners in Science AI and Hubble Science Explore the Night Sky Observatory Hubble Observatory Hubble Design Mission Operations Astronaut Missions to Hubble Hubble vs Webb Team Hubble Team Career Aspirations Hubble Astronauts Multimedia Images Videos Sonifications Podcasts e-Books Online Activities 3D Hubble Models Lithographs Fact Sheets Posters Hubble on the NASA App Glossary News Hubble News Social Media Media Resources More 35th Anniversary Online Activities 2 min read
Hubble Spies Galaxy with Lots to See
This NASA/ESA Hubble Space Telescope features the galaxy NGC 7456. ESA/Hubble & NASA, D. Thilker While it may appear as just another spiral galaxy among billions in the universe, this image from the NASA/ESA Hubble Space Telescope reveals a galaxy with plenty to study. The galaxy, NGC 7456, is located over 51 million light-years away in the constellation Grus (the Crane).
This Hubble image reveals fine detail in the galaxy’s patchy spiral arms, followed by clumps of dark, obscuring dust. Blossoms of glowing pink are rich reservoirs of gas where new stars are forming, illuminating the clouds around them and causing the gas to emit this tell-tale red light. The Hubble observing program that collected this data focused on the galaxy’s stellar activity, tracking new stars, clouds of hydrogen, and star clusters to learn how the galaxy evolved through time.
Hubble, with its ability to capture visible, ultraviolet, and some infrared light, is not the only observatory focused on NGC 7456. ESA’s XMM-Newton satellite imaged X-rays from the galaxy on multiple occasions, discovering many so-called ultraluminous X-ray sources. These small, compact objects emit terrifically powerful X-rays, much more than researchers would expect, given their size. Astronomers are still trying to pin down what powers these extreme objects, and NGC 7456 contributes a few more examples.
The region around the galaxy’s supermassive black hole is also spectacularly bright and energetic, making NGC 7456 an active galaxy. Whether looking at its core or its outskirts, at visible light or X-rays, this galaxy has something interesting for astronomers to study!
Facebook logo @NASAHubble @NASAHubble Instagram logo @NASAHubble Media Contact:
Claire Andreoli (claire.andreoli@nasa.gov)
NASA’s Goddard Space Flight Center, Greenbelt, MD
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Last Updated Sep 04, 2025 Editor Andrea Gianopoulos Location NASA Goddard Space Flight Center Related Terms
Astrophysics Astrophysics Division Galaxies Goddard Space Flight Center Hubble Space Telescope Spiral Galaxies The Universe Keep Exploring Discover More Topics From Hubble
Hubble Space Telescope
Since its 1990 launch, the Hubble Space Telescope has changed our fundamental understanding of the universe.
Science Behind the Discoveries
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