NASA Astronaut Megan McArthur Retires

NASA Astronaut Megan McArthur Retires

Astronaut working on the International Space Station
NASA astronaut and Expedition 65 Flight Engineer Megan McArthur removes Kidney Cells-02 hardware inside the Space Automated Bioproduct Laboratory and swaps media inside the Microgravity Science Glovebox. The human research study seeks to improve treatments for kidney stones and osteoporosis

NASA astronaut Megan McArthur has retired, concluding a career spanning more than two decades. A veteran of two spaceflights, McArthur logged 213 days in space, including being the first woman to pilot a SpaceX Dragon spacecraft and the last person to “touch” the Hubble Space Telescope with the space shuttle’s robotic arm.

McArthur launched as pilot of NASA’s SpaceX Crew-2 mission in April 2021, marking her second spaceflight and her first long-duration stay aboard the International Space Station. During the 200-day mission, she served as a flight engineer for Expeditions 65/66, conducting a wide array of scientific experiments in human health, materials sciences, and robotics to advance exploration of the Moon under Artemis and prepare to send American astronauts to Mars.

Her first spaceflight was STS-125 in 2009, aboard the space shuttle Atlantis, the fifth and final servicing mission to Hubble. As a mission specialist, she was responsible for capturing the telescope with the robotic arm, as well as supporting five spacewalks to update and repair Hubble after its first 19 years in space. She also played a key role in supporting shuttle operations during launch, rendezvous with the telescope, and landing.

“Megan’s thoughtful leadership, operational excellence, and deep commitment to science and exploration have made a lasting impact,” said Steve Koerner, acting director of NASA’s Johnson Space Center in Houston. “Her contributions have helped shape the future of human space exploration, and we are incredibly grateful for her service.”

In addition to her flight experience, McArthur has served in various technical and leadership roles within NASA. In 2019, she became the deputy division chief of the Astronaut Office, supporting astronaut training, development, and ongoing spaceflight operations. She also served as the assistant director of flight operations for the International Space Station Program starting in 2017.

Since 2022, McArthur has served as the chief science officer at Space Center Houston, NASA Johnson’s official visitor center. Continuing in this role, she actively promotes public engagement with space exploration themes, aiming to increase understanding of the benefits to humanity and enhance science literacy.

“Megan brought a unique combination of technical skill and compassion to everything she did,” said Joe Acaba, chief of the Astronaut Office at NASA Johnson. “Whether in space or on the ground, she embodied the best of what it means to be an astronaut and a teammate. Her contributions will be felt by the next generation of explorers she helped train.”

McArthur was born in Honolulu and raised as a “Navy kid” in many different locations worldwide. She earned a Bachelor of Science in aerospace engineering from the University of California, Los Angeles, and a doctorate in oceanography from the Scripps Institution of Oceanography at the University of California, San Diego. Before being selected as an astronaut in 2000, she conducted oceanographic research focusing on underwater acoustics, which involved shipboard work and extensive scuba diving.

McArthur is married to former NASA astronaut Robert Behnken, who also flew aboard the Dragon Endeavour spacecraft during the agency’s SpaceX Demo-2 mission in 2020.

“It was an incredible privilege to serve as a NASA astronaut, working with scientists from around the world on cutting-edge research that continues to have a lasting impact here on Earth and prepares humanity for future exploration at the Moon and Mars,” said McArthur. “From NASA’s Hubble Space Telescope to the International Space Station, our research lab in low Earth orbit, humanity has developed incredible tools that help us answer important scientific questions, solve complex engineering challenges, and gain a deeper understanding of our place in the universe. Seeing our beautiful planet from space makes it so clear how fragile and precious our home is, and how vital it is that we protect it. I am grateful I had the opportunity to contribute to this work, and I’m excited to watch our brilliant engineers and scientists at NASA conquer new challenges and pursue further scientific discoveries for the benefit of all.”

To learn more about NASA’s astronauts and their contributions to space exploration, visit:

https://www.nasa.gov/astronauts

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Shaneequa Vereen
Johnson Space Center, Houston
281-483-5111
shaneequa.y.vereen@nasa.gov

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Wendy K. Avedisian

Landsat 9 Sees Buccaneer Archipelago

Landsat 9 Sees Buccaneer Archipelago

A satellite image shows brown-red, jagged land in the bottom-right corner jutting into blue-green water. Numerous islands dot the rest of the scene. The water appears to swirl around the islands. Some of the coastal areas are dotted with green.
In the sparsely populated Kimberley region of Western Australia, jagged landforms reach like fingers into the turquoise-blue ocean waters. Along the coastline north of Derby, they used to reach even farther. But rising sea levels submerged part of the coastal landscape, giving rise to hundreds of islands and low-lying reefs that compose the Buccaneer Archipelago.
NASA/Michala Garrison; U.S. Geological Survey

The Operational Land Imager on Landsat 9 captured this image of Buccaneer Archipelago on June 11, 2025. The scene encapsulates the striking interactions between land and water in the area where King Sound opens to the Indian Ocean.

The powerful tidal currents stir up sediment in shallow areas, producing the beautiful turquoise swirls visible in this image. This power, however, can be hazardous to seafarers and divers as water rips through the archipelago’s constricted passages. One infamous place of turbulence, known as “Hell’s Gate,” lies in the passage between Gerald Peninsula and Muddle Islands.

Learn more about this archipelago in Western Australia.

Text credit: Kathryn Hansen

Image credit: NASA/Michala Garrison; U.S. Geological Survey

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Monika Luabeya

Hubble Homes in on Galaxy’s Star Formation

Hubble Homes in on Galaxy’s Star Formation

2 min read

Hubble Homes in on Galaxy’s Star Formation

A spiral galaxy, tilted nearly face-on to us, with a slightly unusual shape. Its spiral arms form an oval-shaped ring around the galaxy’s disk, filled with blue light from stars, as well as pink glowing gas bubbles where new stars are forming. Threads of dark red dust swirl around the brightly glowing core, blocking some of its light. The dust lanes extend into and follow the spiral arms.
This NASA/ESA Hubble Space Telescope image features the asymmetric spiral galaxy Messier 96.
ESA/Hubble & NASA, F. Belfiore, D. Calzetti

This NASA/ESA Hubble Space Telescope image features a galaxy whose asymmetric appearance may be the result of a galactic tug of war. Located 35 million light-years away in the constellation Leo, the spiral galaxy Messier 96 is the brightest of the galaxies in its group. The gravitational pull of its galactic neighbors may be responsible for Messier 96’s uneven distribution of gas and dust, asymmetric spiral arms, and off-center galactic core.

This asymmetric appearance is on full display in the new Hubble image that incorporates data from observations made in ultraviolet, near infrared, and visible/optical light. Earlier Hubble images of Messier 96 were released in 2015 and 2018. Each successive image added new data, building up a beautiful and scientifically valuable view of the galaxy.

The 2015 image combined two wavelengths of optical light with one near infrared wavelength. The optical light revealed the galaxy’s uneven form of dust and gas spread asymmetrically throughout its weak spiral arms and its off-center core, while the infrared light revealed the heat of stars forming in clouds shaded pink in the image.

The 2018 image added two more optical wavelengths of light along with one wavelength of ultraviolet light that pinpointed areas where high-energy, young stars are forming.

This latest version offers us a new perspective on Messier 96’s star formation. It includes the addition of light that reveals regions of ionized hydrogen (H-alpha) and nitrogen (NII). This data helps astronomers determine the environment within the galaxy and the conditions in which stars are forming. The ionized hydrogen traces ongoing star formation, revealing regions where hot, young stars are ionizing the gas. The ionized nitrogen helps astronomers determine the rate of star formation and the properties of gas between stars, while the combination of the two ionized gasses helps researchers determine if the galaxy is a starburst galaxy or one with an active galactic nucleus.

The bubbles of pink gas in this image surround hot, young, massive stars, illuminating a ring of star formation in the galaxy’s outskirts. These young stars are still embedded within the clouds of gas from which they were born. Astronomers will use the new data in this image to study how stars are form within giant dusty gas clouds, how dust filters starlight, and how stars affect their environments.

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Media Contact:

Claire Andreoli (claire.andreoli@nasa.gov)
NASA’s Goddard Space Flight Center, Greenbelt, MD

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Space Fitness and Agriculture Top Station Science Schedule

Space Fitness and Agriculture Top Station Science Schedule

NASA astronaut and Expedition 73 Flight Engineer Zena Cardman speaks on a ham radio with the NixderStelar youth organization from Lima, Peru. The youngsters asked about using artificial intelligence on the International Space Station, how research in space benefits humans on Earth, and how living in weightlessness affects their bodies. Astronauts frequently speak to students, professionals, and government officials using the ham radio aboard the orbital outpost's Destiny laboratory module.
NASA astronaut Zena Cardman speaks on a ham radio aboard the International Space Station with the NixderStelar youth organization from Lima, Peru. The youngsters asked about using artificial intelligence on the orbital outpost, how research in space benefits humans on Earth, and how living in weightlessness affects an astronaut’s body.
NASA

The Expedition 73 crew explored microgravity’s effect on bone and plant cells and studied futuristic space workouts aboard the International Space Station on Thursday to keep astronauts fit and promote space agriculture.

The lack of gravity aggravates bone loss on astronauts similar to the aging process on Earth. Exercising every day in space slows the rate of bone loss but does not eliminate it completely. NASA Flight Engineers Jonny Kim and Zena Cardman explored the molecular mechanisms of space-induced bone loss for a new investigation delivered aboard a SpaceX Dragon cargo spacecraft on Aug. 25. The duo took turns operating the study and processing bone stem cell samples inside the Kibo laboratory module’s Life Science Glovebox. Results could help the human skeletal system adapt to spaceflight and lead to advanced treatments for aging conditions and bone diseases on Earth.

Flight Engineer Kimiya Yui of JAXA (Japan Aerospace Exploration Agency) also worked inside Kibo processing algae and tobacco plant cells and stowing them in an artificial gravity-generating research incubator. The cell samples will be imaged inside JAXA’s COSMIC fluorescent microscope to visualize microgravity’s effect on plant cell division and microstructures. Insights may lead to improved methods for growing plants on spacecraft and growing crops on the Moon, Mars, and beyond.

NASA Flight Engineer Mike Fincke began his shift working out for an exercise study observing what happens to a crew member’s bone, muscle, and aerobic health when training without a treadmill on a spacecraft. Fincke worked out on the advanced resistive exercise device that mimics free wights in Earth’s gravity for the human research experiment. Researchers are exploring how the lack of walking on a spacecraft will affect future crews and are adjusting space exercise programs. Due to the size limits of a spacecraft, lighter exercise equipment will be necessary to maintain resistive and aerobic training on long duration missions to the Moon, Mars, and beyond.

Station Commander Sergey Ryzhikov started his shift downloading imagery of Central and Southeast Asia automatically captured overnight as the crew slept. Afterward, he worked on computer software upgrades and filled out a questionnaire helping scientists understand how international crews and mission controllers from around the world communicate with each other.

Roscosmos Flight Engineers Alexey Zubritsky and Oleg Platonov spent their shift on Thursday servicing a wide variety of life support and electronics gear. Zubritsky started his day in the Zarya module examining its power systems then moved into the Zvezda service module and refilled the Elektron oxygen generator. Platonov participated in the computer software upgrades throughout the station’s Roscosmos segment and filmed an educational video demonstrating how objects move in space.

Learn more about station activities by following the space station blog, @space_station on X, as well as the ISS Facebook and ISS Instagram accounts.

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Mark A. Garcia

NASA Awards Spaceflight Operations, Systems Organization Contract

NASA Awards Spaceflight Operations, Systems Organization Contract

The letters NASA on a blue circle with red and white detail, all surrounded by a black background
Credit: NASA

NASA has awarded ASCEND Aerospace & Technology of Cape Canaveral, Florida, the Contract for Organizing Spaceflight Mission Operations and Systems (COSMOS), to provide services at the agency’s Johnson Space Center in Houston.

The COSMOS is a single award, indefinite-delivery/indefinite-quantity contract valued at $1.8 billion that begins its five-year base period no earlier than Dec. 1, with two option periods that could extend until 2034. The Aerodyne Company of Cape Canaveral, Florida, and Jacobs Technology Company of Tullahoma, Tennessee, are joint venture partners.

Work performed under the contract will support NASA’s Flight Operation Directorate including the Orion and Space Launch System Programs, the International Space Station, Commercial Crew Program, and the Artemis campaign. Services include Mission Control Center systems, training systems, mockup environments, and training for astronauts, instructors, and flight controllers.

For more information about NASA and agency programs, visit:

https://www.nasa.gov

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Tiernan Doyle
Headquarters, Washington
202-358-1600
tiernan.doyle@nasa.gov

Chelsey Ballarte
Johnson Space Center, Houston
281-483-5111
chelsey.n.ballarte@nasa.gov

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Tiernan P. Doyle