SPACE/COSMOS
Aboard the International Space Station, viruses and bacteria show atypical interplay
Bacteria-infecting viruses and their hosts accumulate distinctive mutations in near-weightlessness
PLOS
image:
ISS - December 2000
view moreCredit: NASA on The Commons, Flickr (CC0, https://creativecommons.org/publicdomain/zero/1.0/)
In a new study, terrestrial bacteria-infecting viruses were still able to infect their E. coli hosts in near-weightless “microgravity” conditions aboard the International Space Station, but the dynamics of virus-bacteria interactions differed from those observed on Earth. Phil Huss of the University of Wisconsin-Madison, U.S.A., and colleagues present these findings January 13th in the open-access journal PLOS Biology.
Interactions between phages—viruses that infect bacteria—and their hosts play an integral role in microbial ecosystems. Often described as being in an evolutionary “arms race,” bacteria can evolve defenses against phages, while phages develop new ways to thwart defenses. While virus-bacteria interactions have been studied extensively on Earth, microgravity conditions alter bacterial physiology and the physics of virus-bacteria collisions, disrupting typical interactions.
However, few studies have explored the specifics of how phage-bacteria dynamics differ in microgravity. To address that gap, Huss and colleagues compared two sets of bacterial E. coli samples infected with a phage known as T7—one set incubated on Earth and the other aboard the International Space Station.
Analysis of the space-station samples showed that, after an initial delay, the T7 phage successfully infected the E. coli. However, whole-genome sequencing revealed marked differences in both bacterial and viral genetic mutations between the Earth samples versus the microgravity samples.
The space-station phages gradually accumulated specific mutations that could boost phage infectivity or their ability to bind receptors on bacterial cells. Meanwhile, the space-station E. coli accumulated mutations that could protect against phages and enhance survival success in near-weightless conditions.
The researchers then applied a high-throughput technique known as deep mutational scanning to more closely examine changes in the T7 receptor binding protein, which plays a key role in infection, revealing further significant differences between microgravity versus Earth conditions. Additional experiments on Earth linked these microgravity-associated changes in the receptor binding protein to increased activity against E. coli strains that cause urinary tract infections in humans and are normally resistant to T7.
Overall, this study highlights the potential for phage research aboard the ISS to reveal new insights into microbial adaption, with potential relevance to both space exploration and human health.
The authors add, “Space fundamentally changes how phages and bacteria interact: infection is slowed, and both organisms evolve along a different trajectory than they do on Earth. By studying those space-driven adaptations, we identified new biological insights that allowed us to engineer phages with far superior activity against drug-resistant pathogens back on Earth.”
In your coverage, please use this URL to provide access to the freely available paper in PLOS Biology: https://plos.io/4q4S9AO
Citation: Huss P, Chitboonthavisuk C, Meger A, Nishikawa K, Oates RP, Mills H, et al. (2026) Microgravity reshapes bacteriophage–host coevolution aboard the International Space Station. PLoS Biol 24(1): e3003568. https://doi.org/10.1371/journal.pbio.3003568
Author countries: United StatesFunding: This work was supported by the Defense Threat Reduction Agency (https://www.dtra.mil/) (Grant HDTRA1-16-1-0049) to S.R. C.C. was supported by a graduate training scholarship from the Anandamahidol Foundation (Thailand). The sponsors or funders did not play any role in the study design, data collection and analysis, decision to publish, or preparation of the manuscript.
Journal
PLOS Biology
Method of Research
Experimental study
Subject of Research
Cells
COI Statement
Competing interests: I have read the journal’s policy and the authors of this manuscript have the following competing interests: P.H. and S.R. have equity holdings are board members of Synpha Biosciences, a phage therapeutics company. Authors RPO, HM and OH are employees of Rhodium Scientific Inc. The authors declare that they have no other competing interests.
The path to solar weather forecasts
Space-based measurements of solar eruptions are the first of their kind
image:
Diagram to show the different satellites that made up the ad-hoc sensor network in this study. Their combined data helped paint a picture of how a CME in 2022 changed as it passed by the Earth on its way out of the solar system. ©2025 Kinoshita et al. CC-BY-ND
view moreCredit: ©2025 Kinoshita et al. CC-BY-ND
At times the sun ejects energetic material into space which can have consequences for space-based and even ground-based electronic technology. Researchers aim to understand this phenomenon and find ways to forecast it, including how ejected material evolves as it travels through the solar system. For the first time, researchers, including those from the University of Tokyo, made high-quality measurements of an evolving cloud of solar ejecta by using multiple space-based instruments which were not designed to do so, and observed the way the clouds reduce background cosmic-ray activity.
Solar storms, known as coronal mass ejections (CME), are surprisingly common. When detected in the vicinity of Earth, some satellites are even put into a safe, low-power mode until the storm passes in order to protect them. But as with more familiar terrestrial weather, it’s the events you can’t prepare for that necessarily cause the most damage. To aid in this regard, researchers are trying to figure out how CMEs evolve as they head away from their source, the sun. While some different approaches have been tried over time, a new method which pools the resources of several scientific satellites could lead to better space-weather forecasting.
“Understanding how huge clouds of solar material travel through space is essential for protecting satellites, astronauts, and even power grids on Earth,” said Ph.D. researcher Gaku Kinoshita from the Department of Earth and Planetary Science. “In our new paper, we show that the paths of these solar eruptions can be tracked using drops in cosmic rays, high-energy particles that constantly bombard the solar system, measured by spacecraft. By combining observations from several spacecraft at different locations, we were able to watch how one eruption changed shape and strength as it moved away from the sun, revealing new ways to improve space-weather forecasting.”
The researchers’ method works thanks to an effect known as Forbush decrease, which is the way a CME isn't perfectly transparent to cosmic rays coming from behind it. This is because the CME produces a strong magnetic field which can deflect charged particles like cosmic rays. By observing cosmic rays as a CME passes through a region, the team could interpret the physical makeup of the CME, and crucially, how it changes with time.
“In March 2022, three spacecraft — the European Space Agency (ESA)’s Solar Orbiter, ESA and Japan Aerospace Exploration Agency (JAXA)’s BepiColombo, and NASA’s Near Earth Spacecraft — happened to be ideally positioned to observe the same solar eruption from different locations in space. This rare alignment allowed us to compare how the event looked along different directions and distances from the sun,” said Kinoshita. “By combining cosmic-ray data with magnetic-field and solar-wind measurements, we could link changes in the particle signal directly to the physical structure of the eruption. One of the most important results of this work is showing that instruments never designed for science can still deliver valuable scientific data. We used a simple system-monitoring instrument onboard the BepiColombo spacecraft, originally meant only to keep the spacecraft healthy, and, through careful calibration, turned it into a detector of cosmic-ray decreases. Data that had long been ignored turned out to be too valuable to waste.”
While there are advanced instruments capable of monitoring CMEs directly, their operational periods are limited; whereas the above approach repurposes more general instruments that are always on, meaning they can continuously gather data. Researchers can also improve the quality of their data by combining data from multiple spacecraft — this is also important to build a 3D picture of the CMEs.
“Because the instruments used were never intended for scientific research, there was no existing framework to rely on. We had to evaluate an instrument’s behavior, calibrate it from scratch and develop new analysis methods ourselves before we could confidently use the data to study cosmic-ray decreases,” said Kinoshita. “With many spacecraft now operating between the sun and Earth, and more planned for the future, the chances of making routine multipoint observations are increasing. If we continue to combine data from multiple missions and use all available instruments, we can gain a far more complete picture of how solar ejections propagate through space.”
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Journal: Gaku Kinoshita, Beatriz Sanchez-Cano, Yoshizumi Miyoshi, Laura RodrÃguez-GarcÃa, Emilia Kilpua, Benoit Lavraud, Mathias Rojo, Marco Pinto, Yuki Harada, Go Murakami, Yoshifumi Saito, Shoichiro Yokota, Daniel Heyner, David Fischer, Nicolas Andre, and Kazuo Yoshioka, “Spatiotemporal Evolution of the 2022 March Interplanetary Coronal Mass Ejection Revealed by Multipoint Observations of Forbush Decreases”, The Astrophysical Journal, https://doi.org/10.3847/1538-4357/ae1834
Funding: This work was supported by JST SPRING (JPMJSP2108), STFC (ST/V004115/1 and ST/Y000439/1), the European Space Agency, the German Ministry for Economic Affairs and Climate Action / DLR (50QW2202), CNES, and the Institute for Space-Earth Environmental Research (ISEE), Nagoya University.
Useful links:
Graduate School of Frontier Sciences
https://www.k.u-tokyo.ac.jp/en/
Department of Complexity Science and Engineering
https://www.k.u-tokyo.ac.jp/complex/index_e.html
Graduate School of Science
https://www.s.u-tokyo.ac.jp/en/
Department of Earth and Planetary Science
https://www.eps.s.u-tokyo.ac.jp/en/
About The University of Tokyo:
The University of Tokyo is Japan's leading university and one of the world's top research universities. The vast research output of some 6,000 researchers is published in the world's top journals across the arts and sciences. Our vibrant student body of around 15,000 undergraduate and 15,000 graduate students includes over 5,000 international students. Find out more at www.u-tokyo.ac.jp/en/ or follow us on X (formerly Twitter) at @UTokyo_News_en.
Journal
The Astrophysical Journal
Method of Research
Observational study
Subject of Research
Not applicable
Article Title
Spatiotemporal Evolution of the 2022 March Interplanetary Coronal Mass Ejection Revealed by Multipoint Observations of Forbush Decreases
Article Publication Date
13-Jan-2026
New parameterization method for cislunar space cataloging enhances orbital awareness in Earth-Moon system
image:
An orbital parameterization method for Earth-moon collinear libration points
view moreCredit: Chinese Journal of Aeronautics
As lunar exploration intensifies, the cislunar space is experiencing increasing congestion. Traditional two-body Keplerian elements, which have long been the standard for Earth-orbiting objects, prove insufficient for accurately describing the complex orbits near the Earth–Moon Lagrange points due to the chaotic and non-integrable nature of three-body dynamics. This fundamental deficiency has hindered the development of an effective space situational awareness (SSA) framework for this strategically vital region. A research team from the National University of Defense Technology (NUDT) has successfully developed a novel parameterization method (published in the Chinese Journal of Aeronautics, https://doi.org/10.1016/j.cja.2025.103869) for orbits near collinear libration points. This advancement enables the systematic cataloging and robust identification of cislunar objects, representing a critical enabler for the safety and sustainability of future space operations.
Professor Leping Yang, the team's lead scientist, underscored the practical imperatives driving this investigation: "With the lunar economy on the horizon, libration point regions face inevitable congestion. We need an efficient and intuitive cataloging method, analogous to the systems currently employed for Earth orbits, to accurately characterize the situation of cislunar space. Our work aims to build the foundational lexicon for describing orbital mechanics within this emerging domain."
The core contribution of this research involves deriving a new set of dynamical parameters. The study, led by doctoral researchers Chenyuan Qiao and Xi Long, leverages canonical transformations and center manifold theory within the Circular Restricted Three-Body Problem (CRTBP) framework. This procedure effectively translates the complex dynamics near libration points into a set of intuitive parameters.
These parameters distinctly characterize motion along two directions. The hyperbolic parameters (q₁, p₁) function as a monitor, signaling when a spacecraft transits into or out of a libration point orbit and precisely identifying its associated invariant manifold. "This is crucial for understanding spacecraft maneuvers," Chenyuan Qiao explained, "Since many fuel-efficient transfers in cislunar space utilize these invariant manifolds, our parameters provide direct insight into transfer events and subsequent orbital changes."
The center manifold parameters (I₂, θ₂, I₃, θ₃) characterize the quasi-periodic motion of a spacecraft around the libration point. To facilitate the visualization and analysis of this motion, the team employed Poincaré sections, which effectively project the complex four-dimensional phase space onto a two-dimensional plane. "The Poincaré section serves as our cataloging chart," said Chenyuan Qiao, "It establishes a one-to-one correspondence between an orbit's physical characteristics—specifically its amplitudes in the horizontal and vertical directions—and a unique point on the map. Consequently, classic orbital families such as Lyapunov, Halo, and Lissajous orbits each occupy a distinct and identifiable location."
This framework directly enables orbit identification. Given a segment of a spacecraft's observed trajectory, the method determines the best-matching CRTBP reference orbit by minimizing the discrepancy between their respective action variables. The team conducted a sensitivity analysis to demonstrate the method's robustness, showing reliable identification performance, achieving success with position errors up to 100 km and velocity errors below 1 m/s. Notably, the findings suggest that improving velocity measurement accuracy is paramount for the development of future cislunar tracking systems.
While the developed framework represents a significant leap forward, its current applicability is restricted primarily to the collinear libration points (L1 and L2) within the simplified CRTBP. Professor Yanwei Zhu from the team acknowledges the next major challenge explicitly, "The dynamics near the triangular libration points L4 and L5 are significantly influenced by solar gravity, which cannot be ignored. The assumptions underpinning our current model become inadequate there."
The researchers' immediate next step involves extending this parameterization method to a more realistic, non-autonomous ephemeris model that incorporates the gravitational perturbations from the Sun. The ultimate goal is ambitious but critical: to establish a single, unified parameterization and cataloging system applicable to all libration points within the Earth-Moon system. Achieving this comprehensive framework would provide a standardized "common language" for cislunar SSA, which is essential for effectively managing the safe and efficient utilization of the cislunar space in the decades to come.
Original Source
C. QIAO, X. LONG, L. YANG, Y. ZHU, P. WANG, Orbital parameter characterization and objects cataloging for Earth-Moon collinear libration points, Chinese Journal of Aeronautics , 2025, https://doi.org/10.1016/j.cja.2025.103869
About Chinese Journal of Aeronautics
Chinese Journal of Aeronautics (CJA) is an open access, peer-reviewed international journal covering all aspects of aerospace engineering, monthly published by Elsevier. The Journal reports the scientific and technological achievements and frontiers in aeronautic engineering and astronautic engineering, in both theory and practice. CJA is indexed in SCI (IF = 5.7, Q1), EI, IAA, AJ, CSA, Scopus.
Journal
Chinese Journal of Aeronautics
Article Title
Orbital parameter characterization and objects cataloging for Earth-Moon collinear libration points
Dark matter may have begun much hotter than scientists thought
Research challenges decades-old theory and sheds light on the early beginnings of the Universe
University of Minnesota
MINNEAPOLIS / ST. PAUL (01/13/2026) — Researchers at the University of Minnesota Twin Cities and Universit´e Paris-Saclay have challenged a decades-old dark matter theory. Their new research shows that the Universe’s most mysterious material could have been “incredibly hot”–moving at nearly the speed of light–when it was first born.
The study was recently published in Physical Review Letters, the premier journal of the American Physical Society. The research gives new clues about the origins of our Universe and opens up a broader range of possibilities for dark matter and how it interacts with other matter.
Previously, researchers believed for decades that dark matter must be cold–or slow moving–when it “freezes out” from the radiation bath in the early Universe. The team studied dark matter production during an era in the Universe's history known as post-inflationary reheating.
"The simplest dark matter candidate (a low mass neutrino) was ruled out over 40 years ago since it would have wiped out galactic size structures instead of seeding it,” said Keith Olive, professor in the School of Physics and Astronomy. “The neutrino became the prime example of hot dark matter, where structure formation relies on cold dark matter. It is amazing that a similar candidate, if produced just as the hot big bang Universe was being created, could have cooled to the point where it would in fact act as cold dark matter."
Researchers showed that dark matter can decouple while ultrarelativistic–or very hot–and still have time to cool before galaxies begin to form into what we know today. The key feature which enables this to be possible is that dark matter is produced during an era in the early Universe's history known as reheating.
"Dark matter is famously enigmatic. One of the few things we know about it is that it needs to be cold,” said Stephen Henrich, graduate student in the School of Physics and Astronomy and lead author of the paper. “As a result, for the past four decades, most researchers have believed that dark matter must be cold when it is born in the primordial universe. Our recent results show that this is not the case; in fact, dark matter can be red hot when it is born but still have time to cool down before galaxies begin to form."
The research will continue by determining the best methods to detect these particles either directly using colliders or scattering experiments, or indirectly via astrophysical observations.
"With our new findings, we may be able to access a period in the history of the Universe very close to the Big Bang,” said Yann Mambrini, professor from the Universit´e Paris-Saclay in France and co-author on the paper.
This research was funded by the European Union's Horizon 2020 research and innovation program under the Marie Sklodowska-Curie grant agreement.
Read the full paper entitled, “Ultrarelativistic freeze-out: a bridge from WIMPs to FIMPs,” on the American Physical Society’s website.
Journal
Physical Review Letters
Article Title
Ultrarelativistic Freeze-Out: A Bridge from WIMPs to FIMPs
Giant Magellan Telescope names Daniel T. Jaffe as president
New leadership announced to guide the next phase of funding and construction
GMTO Corporation
image:
Daniel Jaffe
view moreCredit: Giant Magellan Telescope – GMTO Corporation
PASADENA, CA – January 13, 2026 – The GMTO Corporation, the international consortium building the Giant Magellan Telescope, today announced it has appointed Daniel T. Jaffe as president, succeeding Robert N. Shelton, who announced his retirement last year after guiding the observatory through a period of significant growth.
“Dan brings decades of leadership in research, astronomy instrumentation, public-private partnerships, and academia,” said Taft Armandroff, board chair of the GMTO Corporation. “His deep understanding of the Giant Magellan Telescope, combined with his experience leading large research enterprises and cultivating a collaborative environment, make him exceptionally well suited to lead the observatory through its next phase of construction and toward operations.”
Jaffe served as vice president for research at The University of Texas at Austin from 2016 to 2025. During his tenure, research expenditures increased by 89% and the university landed important new research centers funded by the National Science Foundation (NSF), National Institutes of Health (NIH), Defense Advanced Research Projects Agency (DARPA), and Department of Energy (DOE). He led the university’s academic enterprise through the COVID-19 pandemic while serving as interim provost from 2020 to 2021. He is the Jane and Roland Blumberg Centennial Professor in the Department of Astronomy and was department chair from 2011 to 2015.
Jaffe’s experience includes serving on the board of directors of the Association of Universities for Research in Astronomy (AURA) and the Gemini Observatory. He also played a lead role in establishing The University of Texas at Austin’s partnership in the Giant Magellan Telescope while serving on its Science Advisory Council. His honors include Harvard University’s Bart J. Bok Prize, a Humboldt Fellowship, and a David and Lucile Packard Foundation Fellowship.
“I am honored to lead the Giant Magellan Telescope at this exciting stage,” Jaffe said. “Robert Shelton leaves behind a strong foundation, and I look forward to working with our consortium partners and the U.S. government to advance construction. For me, as for the U.S. astronomical community and our international partners, the Giant Magellan Telescope represents a profound leap in our ability to explore the Universe and employ a host of new technologies to make fundamental discoveries.”
Jaffe is widely recognized for developing advanced astronomical instrumentation that enhances telescope performance. His research group pioneered the manufacture and use of micromachined silicon diffractive immersion gratings for high-resolution spectroscopy, a technology that has reshaped modern instrument design. His devices are used on both ground-based telescopes, including those at the McDonald Observatory, as well as space-based observatories such as the National Aeronautics and Space Administration’s (NASA) James Webb Space Telescope. Jaffe’s IGRINS spectrograph has served the astronomical community at multiple leading observatories. His latest instrument, the Giant Magellan Telescope Near-Infrared Spectrograph (GMTNIRS), will revolutionize the study of planetary system formation, small stars, and other near-infrared objects.
Jaffe joins the GMTO Corporation at a pivotal time, as the Giant Magellan Telescope continues to gain momentum as one of the most ambitious research projects in astronomy. In June 2025, the NSF advanced the observatory into its Final Design Phase, one of the final steps before becoming eligible for federal construction funding. The recent addition of Northwestern University and the Massachusetts Institute of Technology to its international consortium also underscores the observatory’s status as a top research priority for the world’s leading institutions. These partnerships further strengthen the observatory’s scientific and artificial intelligence (AI) capabilities in exoplanets, cosmology, and time-domain astronomy, while also reinforcing its strategic ties with the Vera C. Rubin Observatory in Chile.
With this leadership transition, the board of directors of the GMTO Corporation reaffirms its commitment to completing the NSF’s Final Design Phase and its next funding round to continue advancing the Giant Magellan Telescope beyond its current 40% under-construction status.
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