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Station Science Top News: Sept. 27, 2024


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Researchers found that long-duration spaceflight affected the mechanical properties of eye tissues, including reducing the stiffness of tissue around the eyeball. A better understanding of these changes could help researchers prevent, diagnose, and treat the vision impairment often seen in crew members.

SANSORI, a Canadian Space Agency investigation, examined whether reduced stiffness of eye tissue contributes to vision impairment in astronauts on long-term missions. This condition, known as Spaceflight Associated Neuro-Ocular Syndrome, or SANS, includes a range of physical changes to the eyes. This paper suggests that biomechanical changes in the eye caused by microgravity contribute to SANS. On Earth, changes in the tissue around the eyeball (the scleral wall or white of the eye) related to ocular rigidity have been associated with aging and pathological conditions such as glaucoma and myopia.

An optical coherence tomography scan of the eye showing choroidal thickness, with colored lines marking different layers. A graph below the image displays two signals over time: a blue line representing choroidal thickness and a red line representing the oximeter signal.
An optical coherence tomography image of the eye’s posterior segment shows choroidal thickness, with segmentation lines marking retinal boundaries. The bottom graph displays choroidal thickness and oximeter signal variations over time.
Image courtesy of the University of Montreal

In April 2022, researchers identified more than 80 Transient Luminous Events (TLEs) such as Emissions of Light and Very-Low-Frequency perturbations from Electro-magnetic pulses (ELVES) and blue corona discharges, rare phenomena that are part of a group of upper atmospheric thunderstorm discharges called blue optical emissions. Insights into blue optical emissions could help scientists understand how thunderstorms affect Earth’s atmosphere and help improve meteorological and climatological predictions.

ILAN-ES (Ax-1) collected images of lightning and TLEs during Axiom Mission 1 (Ax-1). TLEs are electrical phenomena above thunderstorms, which include ELVES. Researchers combined observations from the International Space Station with a global network of ground-based cameras to calculate the energy, structure, and other parameters of TLEs. This work contributes to understanding of these events and their relationship to lightning, geographic distribution, and global occurrence rate.

Read more here.

A view of Earth’s atmosphere from space, showing a bright blue lightning-like phenomenon striking upwards from a storm system. The International Space Station is visible in the top left, hovering above the Earth’s curvature.
An artist’s impression of a blue jet observed from the International Space Station. The European Space Agency’s Thor-Davis investigation photographs lightning from the vantage point of space.
Image courtesy of Mount Visual/University of Bergen/Technical University of Denmark Space

Two civilian astronauts from the 17-day Ax-1 mission showed normal ranges for 14 health biomarkers and both maintained good cardiac, liver, and renal health as well as adequate glucose and electrolyte balance. As more civilians travel to space, scientists need to assess their health risks and develop mitigation measures, and this study provides a baseline for beginning that process.

Cardioprotection Ax-1 analyzed cardiovascular changes in private astronaut mission crew members. Human research in space has focused on professional astronauts, but as spaceflight opportunities expand, more diverse populations have a chance to experience the space environment. The Ax-1 mission provided an opportunity to monitor civilian responses to space and yielded an initial record of civilian in-flight bioanalytics.

A group of astronauts poses for a photo inside the International Space Station. The scene shows eight crew members floating in microgravity, with some positioned upside down and others upright, surrounded by cargo bags and equipment. One astronaut in the foreground holds a welcome sign, while all wear matching NASA flight suits.
The 11-person crew aboard the International Space Station includes (clockwise from bottom right) Expedition 67 Commander Tom Marshburn, and Flight Engineers Oleg Artemyev, Denis Matveev, Sergey Korsakov, Raja Chari, Kayla Barron, and Matthias Maurer; and Axiom Mission 1 astronauts (center row from left) Mark Pathy, Eytan Stibbe, Larry Conner, and Michael Lopez-Alegria.

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      Last Updated Nov 14, 2024 Related Terms
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      Tiernan Doyle
      Headquarters, Washington
      202-358-1600
      tiernan.doyle@nasa.gov
      Sandra Jones 
      Johnson Space Center, Houston
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      sandra.p.jones@nasa.gov
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      Last Updated Nov 12, 2024 EditorTiernan P. DoyleLocationNASA Headquarters Related Terms
      International Space Station (ISS) Astronauts Communicating and Navigating with Missions Humans in Space ISS Research Johnson Space Center Near Space Network Space Communications & Navigation Program Sunita L. Williams View the full article
    • By NASA
      NASA/Loral O’Hara The Choctaw Heirloom Seeds investigation flew five varieties of heirloom seeds from the Choctaw Nation of Oklahoma aboard the International Space Station in early November 2023. The seeds are Isito (Choctaw Sweet Potato Squash), Tobi (Smith Peas), Tanchi Tohbi (Flour Corn), Tvnishi (Lambsquarter), and Chukfi Peas. The seeds spent six months aboard station, returning to Earth in April 2024.
      Next spring, Jones Academy students will plant the space-flown seeds alongside Earth-bound seeds of the same type in the school’s Growing Hope Garden. Students will hypothesize how the seeds will grow and make observations throughout the growing season.
      Middle school teachers are developing curriculum incorporating the seeds’ journey to space station and students’ experiments in the garden. This research could impact Native and Indigenous populations across the United States, inviting underrepresented groups to engage with science, technology, engineering, and mathematics.
      Image credit: NASA/Loral O’Hara
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