Autumn Colors Poland's Bieszczady Mountains in NASA Image of the Day

NASA has released an image of the Bieszczady Mountains, in southeastern Poland, showing the forests of Bieszczady National Park tinted by autumn coloration. The tree-covered slopes display warm tones, while the polonina — high-mountain meadows characteristic of this Carpathian region — have already turned tan. Polonina are high-altitude grassland formations occupying summits and ridges above the tree line, maintained in this area for centuries by grazing and by the mountain climate. Their transition to autumn hues contrasts with the mosaic of colors of the beech and birch forest covering the park's slopes. The photograph is part of the series of Earth observation images the U.S. space agency publishes daily, in which satellites and astronauts document natural phenomena and seasonal changes seen from orbit. In this case, the image captures the moment when Central Europe's mountain vegetation enters its winter transition phase.

Supernumerary Rainbow Arcs Observed Over New Jersey

A rainbow photographed over New Jersey has revealed the presence of supernumerary arcs, an atmospheric optical phenomenon less common than primary and secondary rainbows. These additional arcs, appearing as pale, repeating bands of color within the main rainbow, offer insight into the wave nature of light and the complexity of its interaction with water droplets in the atmosphere. The image, highlighted by the Astronomy Picture of the Day (APOD) program, underscores the beauty and underlying physics of everyday meteorological phenomena. Supernumerary arcs are not a reflection of light like the main rainbows, but rather result from the interference of light waves. When sunlight strikes water droplets, it is refracted and internally reflected. However, because water droplets are not point sources of light but spheres of finite size, the light rays emerging from them can interfere constructively and destructively. This interference produces a pattern of color bands that overlap the primary rainbow, being most visible on its inner side and with colors repeating in a different order than the main spectrum (red, orange, yellow, etc.). The visibility of supernumerary arcs critically depends on the uniform size of water droplets in the atmosphere. If the droplets are of very similar and relatively small size (around 0.1 to 1 mm in diameter), the interference is more coherent and the arcs are more pronounced. Conversely, if the droplets vary greatly in size, the interference patterns average out and the supernumerary arcs fade. This phenomenon is a classic example of light diffraction, where light bends around the edges of an obstacle or spreads out when passing through an aperture, in this case, water droplets. The observation of these supernumerary arcs not only delights the eye but also serves as a tangible demonstration of the principles of physical optics. It allows scientists to study the properties of light and the composition of the atmosphere, as well as validate theoretical models of light scattering. While not a new discovery, each observation of supernumerary arcs reinforces our understanding of how fundamental physics manifests in the natural world, offering a unique perspective on the interaction between light and matter on a macroscopic scale.

Astronaut Christina Koch to Join NASA Event in Philadelphia

NASA astronaut Christina Koch will participate in a public event in Philadelphia on Sunday, October 4, as part of the agency's "Inspiration Tour." Her appearance will take place during the American football game between the Philadelphia Eagles and the Los Angeles Rams. Koch will highlight the United States' strengths in space exploration and aeronautical innovation. Christina Koch, an engineer and explorer, is known for having spent a total of 338 days in space, setting a record for the longest single space mission by a woman. This event is part of NASA's efforts to inspire the public and share the achievements and future of space exploration.

Dual fear mechanisms shaping stochastic population dynamics under the Allee effect

A recent study has explored how two distinct fear mechanisms can influence stochastic population dynamics, especially when these populations are subject to the Allee effect. The Allee effect describes a phenomenon where the per capita growth rate of a population decreases at low densities, which can lead to extinction. The research focuses on how the presence of predators, or the perception of their risk, can alter the reproductive and survival behavior of prey species, introducing additional complexity in modeling their persistence. The two identified fear mechanisms are direct fear and indirect fear. Direct fear refers to individuals' immediate response to the real or perceived presence of a predator, which can result in reduced foraging activity or increased physiological stress. On the other hand, indirect fear manifests through changes in habitat or the social structure of the population, such as avoiding high-risk areas or altering mating patterns. Both mechanisms, though distinct, can interact and amplify the negative effects of the Allee effect, making populations more vulnerable to extinction. Using stochastic models, researchers have quantified how these fear mechanisms can push populations below the critical threshold of the Allee effect, even in scenarios where direct predation is not the primary cause of mortality. The results suggest that conservation management must consider not only reducing predation but also factors that generate fear in populations, such as habitat fragmentation or human presence. Understanding these dynamics is crucial for developing more effective conservation strategies that allow species to persist in changing environments.

The 1926 Nobel: Observing Brownian Motion

The 1926 Nobel Prize in Physics was awarded to Jean Baptiste Perrin for his work on the discontinuous structure of matter and the discovery of sedimentation equilibrium. This recognition marked a milestone in the acceptance of atomic theory, providing robust experimental confirmation of the existence of atoms and molecules through the study of Brownian motion. Perrin, building on the theoretical predictions of Albert Einstein and Marian Smoluchowski, conducted a series of meticulous experiments. He observed pollen particles suspended in water, demonstrating that their random and erratic movement, Brownian motion, was a direct consequence of impacts from invisible water molecules. His precise measurements of particle distribution as a function of height, known as sedimentation equilibrium, allowed him to determine Avogadro's number with unprecedented accuracy. This value, which relates the macroscopic to the microscopic scale, was crucial for establishing the reality of atoms. Prior to Perrin's work, the existence of atoms was a widely debated hypothesis within the scientific community. Although atomic theory had been proposed much earlier, it lacked conclusive experimental proof to convince everyone. Perrin's experiments not only validated Einstein's equations for Brownian motion but also provided irrefutable evidence of the discrete nature of matter, settling the debate and laying the groundwork for much of modern physics and chemistry.

Gandak River Reaches Record Levels After Torrential Rains

The Gandak River has experienced a significant increase in its flow, reaching record-breaking levels in several regions of Nepal and India. This rise is attributed to the intense and continuous rainfall that has affected the area in recent days, causing an unprecedented surge in the river system. The situation has raised concerns among local authorities and riparian communities, who face potential flooding and its consequent impacts. Monitoring river levels is crucial at this time to assess the risk and coordinate necessary response measures.

Máquinas de Ising: Menos sensibilidad a hiperparámetros

Investigadores han desarrollado un nuevo enfoque para las máquinas de Ising basadas en retroalimentación de medida que reduce significativamente su sensibilidad a los hiperparámetros. Este avance es crucial para la estabilidad y la aplicabilidad de estas arquitecturas, que buscan resolver problemas computacionales complejos mapeándolos a la minimización de energía de un modelo de Ising. La dificultad de ajustar los hiperparámetros, que controlan el comportamiento del sistema, ha sido un obstáculo importante para su implementación práctica, ya que pequeños cambios pueden llevar a un rendimiento muy variable o incluso a la inoperatividad de la máquina. La nueva metodología promete hacer estas máquinas más robustas y fáciles de operar, abriendo la puerta a una exploración más eficiente de sus capacidades computacionales. El problema de la sensibilidad a los hiperparámetros surge porque las máquinas de Ising, especialmente las que emplean retroalimentación de medida, dependen de un ajuste preciso de múltiples parámetros para guiar el sistema hacia el estado fundamental de energía, que codifica la solución al problema. Estos parámetros incluyen, por ejemplo, las tasas de retroalimentación, las ganancias de los amplificadores o los tiempos de integración. Un ajuste subóptimo puede atrapar el sistema en mínimos locales o impedir que converja, limitando su capacidad para encontrar soluciones de alta calidad. La investigación anterior a menudo requería una calibración meticulosa y específica para cada problema, lo que restaba escalabilidad y eficiencia. La clave del nuevo método reside en una estrategia de control adaptativo que ajusta dinámicamente los hiperparámetros durante la operación, en lugar de fijarlos de antemano. Esto permite que la máquina se adapte a las particularidades de cada problema y a las fluctuaciones ambientales, manteniendo un rendimiento óptimo sin la necesidad de una sintonización manual exhaustiva. Los resultados demuestran una mejora sustancial en la robustez y la reproducibilidad de las soluciones obtenidas, incluso frente a variaciones significativas en las condiciones iniciales o en los parámetros del problema. Este avance es un paso fundamental hacia la creación de máquinas de Ising más autónomas y fiables. Las implicaciones de esta investigación son amplias, particularmente para campos como la optimización combinatoria, el aprendizaje automático y la simulación de sistemas complejos. Al reducir la carga de la sintonización de hiperparámetros, los científicos e ingenieros podrán dedicar más tiempo a formular problemas y menos a la calibración de la máquina. Esto podría acelerar el desarrollo de algoritmos de optimización cuántica y clásicos inspirados en el modelo de Ising, facilitando la exploración de nuevos enfoques para problemas que actualmente son intratables para los ordenadores convencionales. El siguiente paso será validar este enfoque en arquitecturas de máquinas de Ising de mayor escala y con problemas de mayor complejidad.

NASA Opens Second Season of ORBIT Student Challenge

NASA has announced the opening of applications for the second season of its ORBIT (Opportunities in Research, Business, Innovation, and Technology) challenge. This initiative aims to foster university student innovation in technological development for Earth and deep-space exploration. Following a successful inaugural year, the program seeks to continue driving the creativity and professional development of the next generation of scientists and engineers. This challenge represents a crucial platform for students to apply their knowledge to projects with real impact on the space agency's missions. The ORBIT program is designed to integrate students into research, business development, innovation, and technology projects that address current NASA challenges. The first season of the challenge already demonstrated the potential of this initiative to generate novel solutions and to offer participants invaluable practical experience. The deadline for registration for the 2026-2027 season is Monday, November 16, 2026, providing an ample window for university teams to prepare their proposals and join this collaborative opportunity with the space agency.

NASA Launches Flight Design Challenge for Students

NASA has announced the "Fueling Flight Design Challenge: New Energy Systems" for the 2026-2027 academic year, targeting middle school students. This program aims to engage the next generation in finding innovative solutions for aviation, addressing the growing demand for flights and the need for safer, more efficient energy systems. The initiative is part of a broader effort by NASA and its collaborators, including the Federal Aviation Administration (FAA), universities, and the aviation industry, to enhance the safety and sustainability of the U.S. National Airspace System (NAS) in response to increasing air traffic. The challenge invites students to explore and propose aircraft designs that utilize alternative or improved energy sources. While the announcement is preliminary and does not detail specific technical requirements, participants are expected to investigate concepts such as electric, hybrid, or hydrogen-based propulsion, as well as improvements in aerodynamic efficiency and emission reduction. The goal is to foster critical thinking and creativity in aeronautical engineering, preparing future professionals for the challenges of the sector. These types of educational programs are crucial for inspiring scientific and technological vocations. By focusing on a real and highly relevant problem such as the energy transition in aviation, NASA seeks not only to generate fresh ideas but also to raise awareness about the importance of research and development in achieving more sustainable air transport. Full details regarding registration, evaluation criteria, and available resources for participating teams will be published at a later date.

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Publisher Correction: Optical control of electrons in a Floquet topological insulator

This is a publisher's correction notice. The original article, titled "Optical control of electrons in a Floquet topological insulator", published in Nature, has been updated to correct errors in its content. Such corrections are standard in scientific publishing and ensure the integrity and accuracy of the research presented to the community. The exact nature of the corrections is not detailed in this notice, but they typically involve adjustments to data, figures, equations, or the interpretation of results. It is crucial for readers and other researchers to consult the corrected version of the article to ensure they are working with the most accurate and validated information. This correction process is an essential part of scientific rigor and peer review.

NASA Astronaut to Answer Student Questions from ISS

NASA astronaut Anil Menon will answer prerecorded STEM questions from New Hampshire students. The Earth-to-space call will take place from the International Space Station (ISS) and is scheduled for Thursday, September 24, beginning at 11:40 a.m. EDT. This event aims to inspire the next generation of scientists and engineers, offering a unique opportunity for students to interact directly with an orbiting astronaut. The initiative underscores NASA's commitment to STEM education and space mission outreach, connecting the experience of space exploration with classroom learning.

Astronaut Reid Reid Wiseman Attends NFL Game in Baltimore

NASA astronaut and commander of the Artemis II mission, Reid Wiseman, a Baltimore native, attended an NFL game between the New Orleans Saints and the Baltimore Ravens. The event took place on Sunday, September 20, 2026, at M&T Bank Stadium in Baltimore, where Wiseman took a selfie with fans. NASA's engagement at NFL games is part of its "Inspiration Tour," an agency initiative to foster public interest in its space missions and programs. These types of events aim to connect directly with the public, using prominent figures like Wiseman to inspire new generations and maintain support for space exploration. The presence of an astronaut at a high-visibility sporting event underscores NASA's effort to bring science and exploration closer to a broad and diverse audience.

Johnson Space Center at Houston's Japan Festival

Employees from NASA's Johnson Space Center participated in the 33rd Annual Japan Festival in Houston, held on September 12 and 13. The event, which takes place at Hermann Park, is a celebration of Japanese culture, offering attendees an immersion in its traditions through gastronomy, dance, martial arts, and music. The Johnson Center's involvement in this festival has been maintained for years, contributing to the dissemination of space exploration among the general public. The presence of the Johnson Space Center at the festival underscores NASA's interest in fostering scientific curiosity and knowledge about space in diverse cultural contexts. Although the festival focuses on Japanese culture, the inclusion of a NASA exhibitor allows visitors to explore the connection between science, technology, and society, and how space exploration inspires people of all ages and backgrounds.

Transposons: From "Jumping Genes" to Evolutionary Partners

Half of our genome is made of transposons—DNA snippets that can move and copy themselves. Far from being mere "jumping genes" or "junk DNA," these sequences have proven to be much more than genetic parasites. Recent research suggests that transposons have played a crucial role in the evolution of species, including our own, acting as collaborators rather than simple intruders. Traditionally, transposons have been viewed as selfish elements, capable of inserting themselves into different points of the genome and, at times, causing harmful mutations. However, their omnipresence and persistence throughout evolution indicate a more complex function. It has been discovered that they can influence gene regulation, chromosomal structure, and the creation of new genetic functions, thus contributing to the diversity and adaptability of organisms. Their study opens new avenues for understanding how genomic plasticity drives evolutionary change.

NASA Releases Calendar of Events and Gatherings for 2026

NASA has published a list of widely attended gatherings (WAGs) scheduled for 2026. This calendar details a variety of activities ranging from recognition ceremonies to aerospace business association galas and events related to specific space missions. Key events include the National Aerospace Hall of Fame (NAHF) Enshrinement Ceremony on September 24, 2026, and "An Evening with the Stars" on September 16. Meetings with business groups such as the Maryland Space Business Roundtable (MSBR) and the Virginia Aerospace Business Association (VASBA) are also listed, with their respective galas scheduled for September. The agency will also participate in international events like the Farnborough Airshow in July 2026. The calendar also mentions an event dedicated to the Roman Space Telescope on August 28, 2026, and a celebration of the Viking mission anniversary organized by The Planetary Society on July 20. Other engagements include activities with the University of Maryland and an event at the Smithsonian National Air and Space Museum in collaboration with Blue Origin, both in July 2026. This publication provides insight into NASA's interactions and engagement with the aerospace community and the general public for the upcoming year.

Parámetros de diseño de globos de superpresión y su rendimiento de vuelo

Un estudio reciente ha investigado cómo los parámetros de diseño de los globos de superpresión influyen en su rendimiento de vuelo. Los globos de superpresión (SPB, por sus siglas en inglés) son vehículos aéreos no tripulados que mantienen una altitud constante durante largos periodos de tiempo, lo que los hace ideales para misiones científicas de larga duración, como la observación astronómica o la monitorización atmosférica. La investigación se centró en comprender la relación entre las características estructurales del globo y su capacidad para mantener la flotación y la estabilidad en la estratosfera. El trabajo aborda la necesidad de optimizar el diseño de estos globos para maximizar su eficiencia y duración de misión. Tradicionalmente, el diseño de SPB ha implicado un equilibrio complejo entre la capacidad de carga, la resistencia estructural y la estabilidad aerodinámica. Este estudio utiliza modelos numéricos y simulaciones para explorar cómo variaciones en el material de la envoltura, la forma del globo y el sistema de lastre afectan directamente la altitud de crucero, la deriva y la resistencia a condiciones atmosféricas adversas. Se buscaron configuraciones que permitan un vuelo más estable y predecible, reduciendo la necesidad de ajustes activos y prolongando la vida útil operativa. Los resultados clave del estudio incluyen la identificación de rangos óptimos para el grosor del material de la envoltura y la distribución del volumen interno que minimizan las fluctuaciones de altitud. Se encontró que una relación específica entre el volumen del globo y la superficie de la envoltura es crucial para lograr una flotación eficiente y una respuesta adecuada a los cambios de temperatura ambiente. Además, se cuantificó el impacto de diferentes estrategias de gestión de lastre en la capacidad del globo para recuperarse de descensos inesperados. Estos hallazgos proporcionan una base sólida para el desarrollo de futuras generaciones de globos de superpresión con capacidades mejoradas. Las implicaciones de esta investigación son significativas para misiones científicas que dependen de plataformas de gran altitud y larga duración. Un diseño optimizado de SPB podría permitir observaciones astronómicas más estables, una recopilación de datos atmosféricos más continua y un despliegue más eficiente de instrumentos de teledetección. El estudio sienta las bases para futuros experimentos de validación en vuelo y para la incorporación de estos principios de diseño en la próxima generación de globos estratosféricos, abriendo nuevas posibilidades para la exploración científica a gran altitud.

Análisis de flexión de placas circulares con teoría térmica fraccional

Un estudio reciente ha investigado el comportamiento de flexión de placas circulares bajo condiciones térmicas variables, utilizando una teoría termoelástica fraccional de Lord-Shulman refinada. Este enfoque es crucial para comprender cómo los materiales se deforman y distribuyen el calor en entornos con gradientes térmicos complejos, especialmente cuando la conductividad térmica del material no es constante sino que varía con la temperatura. La novedad reside en la aplicación de la derivada fraccional para describir la transferencia de calor, lo que permite modelar fenómenos de memoria y no-localidad en el transporte de energía, algo que las teorías clásicas no capturan adecuadamente. La investigación se centró en placas circulares isotrópicas, un componente fundamental en diversas aplicaciones de ingeniería, desde estructuras aeroespaciales hasta dispositivos electrónicos. Los autores emplearon un modelo que considera la conductividad térmica como una función lineal de la temperatura, lo que añade una capa de realismo a la simulación. La teoría de Lord-Shulman, que incorpora un tiempo de relajación térmico, ya es una mejora sobre la teoría clásica de Fourier al predecir una velocidad finita para la propagación del calor. Al integrar el cálculo fraccional, se logra una descripción aún más precisa de la respuesta del material ante perturbaciones térmicas rápidas y transitorias. Para resolver las ecuaciones gobernantes del modelo, se utilizaron técnicas numéricas avanzadas, lo que permitió obtener distribuciones detalladas de temperatura, desplazamiento y tensiones a través de la placa. Los resultados demuestran la influencia significativa de la conductividad térmica variable y el orden de la derivada fraccional en el perfil de flexión y la distribución de esfuerzos. Este tipo de análisis es fundamental para el diseño y la optimización de componentes que operan bajo cargas térmicas extremas, donde la predicción precisa de la deformación y la resistencia es crítica para evitar fallos estructurales. Las implicaciones de este trabajo son amplias, ofreciendo una herramienta más sofisticada para ingenieros y científicos de materiales. Permite una caracterización más fiel del comportamiento termomecánico de materiales avanzados, como los utilizados en la industria nuclear, aeroespacial o en microelectrónica, donde las propiedades térmicas pueden cambiar drásticamente con la temperatura. Futuras investigaciones podrían extender este modelo a geometrías más complejas o a materiales anisotrópicos, proporcionando una base para el desarrollo de nuevos materiales con propiedades termoelásticas optimizadas.

NASA Astronaut Reid Wiseman Joins Inspiration Tour

NASA astronaut Reid Wiseman, commander of the Artemis II mission, will participate in the agency's new Inspiration Tour. His first prominent appearance will be at the American football game between the Baltimore Ravens and the New Orleans Saints in Baltimore on Sunday, September 20. The tour's objective is to highlight America's strengths in space exploration and aeronautics innovation to a broad audience. Wiseman, a Baltimore native, is a 27-year Navy veteran. His participation in public events like this aims to connect directly with the public, sharing NASA's vision and achievements, especially in the context of the Artemis II mission, which will mark a milestone in humanity's return to the Moon. The Inspiration Tour is a NASA initiative to foster interest in science and engineering, as well as to emphasize the importance of investment in space technology.

Indonesia's Anak Krakatau Volcano Erupts, Captured by Landsat 8

Indonesia's Anak Krakatau volcano, located between the islands of Java and Sumatra, has experienced an eruption, releasing ash and volcanic gases. This event was captured by the Operational Land Imager (OLI) aboard the Landsat 8 satellite on September 5, 2026. Eruptions are a regular occurrence at this small volcano, known for its constant activity. While much of Anak Krakatau's activity is typically relatively mild, the volcano is known to occasionally exhibit more intense episodes. Satellite monitoring, such as that provided by Landsat 8, is crucial for tracking the evolution of these events, especially in volcanically active regions, allowing scientists to analyze the composition of emissions and assess potential risks.

NASA Ames Recognizes Its Outstanding Scientists of September 2026

The NASA Ames Research Center's Science Directorate has recognized the outstanding contributions of seven of its scientists as "Stars of the Month" for September 2026. This acknowledgment highlights the commitment, technical expertise, and collaborative spirit required to advance NASA's mission, which spans from exploring our own planet to deep space research. The honorees are Steve Ormsby, Aphrodite Kostakis, Alejandro Borlaff, Sarah Nickerson, Martina Caussi, Keiko Nomura, and Stephen Broccardo. These scientists have been selected for their fundamental roles in various research areas within NASA Ames. Their work represents the diversity of disciplines that underpin space exploration and technological development, reflecting the entrepreneurial spirit and dedication that characterize the agency. The "Stars of the Month" distinction aims to highlight individual excellence and collective impact on NASA's scientific and engineering objectives. The recognition of these professionals by NASA Ames not only celebrates their individual achievements but also underscores the importance of teamwork and continuous innovation in space research. Their contributions are essential for the progress of current and future missions, as well as for generating knowledge that expands our understanding of the universe and our place within it.

NASA Astronaut Candidates Progress in Training for 2025 Missions

NASA's 2025 Astronaut Candidate Class has continued its rigorous training program over the summer. Since their public introduction on September 22, 2025, at the Johnson Space Center, the ten candidates have been immersed in comprehensive training designed to prepare them for future space missions. This summer period has included activities simulating the conditions and demands of space exploration, ranging from survival in extreme environments to aircraft familiarization. NASA's training program is multifaceted, aiming to equip future astronauts with a wide range of skills. This includes instruction in spacecraft systems, International Space Station operations, extravehicular activities (EVA), robotics, and Russian, a crucial language for international space collaboration. Additionally, they undergo intensive physical training and emergency scenario simulations, ensuring they are prepared for any eventuality during a mission.

NASA Kicks Off Outreach Tour at NFL Games

NASA has launched an "Inspiration Tour" aimed at strengthening connections between the space agency and the public, particularly youth. This initiative involves participating in large-scale sporting events, such as National Football League (NFL) games. The tour's kickoff took place on September 13, 2026, at Acrisure Stadium in Pittsburgh, Pennsylvania, during a game between the Pittsburgh Steelers and the Atlanta Falcons. At this event, NASA set up a "NASA Experience Zone" where fans had the opportunity to interact with astronauts and learn about the agency's missions and projects. These activities seek to spark interest in science, technology, engineering, and mathematics (STEM) among a diverse audience.

Semantic Alignment Can Diverge From Local Neighborhood Preservation in Dimensionality Reduction Visualizations

A recent study has explored how dimensionality reduction visualizations, essential tools for understanding complex datasets, can distort information. Specifically, it has been shown that semantic alignment, meaning the grouping of items with similar meanings, can diverge significantly from local neighborhood preservation. This implies that two points close in a low-dimensional visualization do not always represent semantically close concepts in the original high-dimensional space, and vice versa. Traditionally, it is assumed that dimensionality reduction techniques, such as t-SNE or UMAP, aim to maintain the neighborhood relationships of the original space in the low-dimensional representation. However, this research reveals that optimizing semantic alignment, a desirable goal for human interpretability, does not always coincide with strict preservation of local distances. This divergence can lead to misinterpretations of data, where visual proximity does not reflect underlying conceptual similarity or where related concepts appear distant. These findings suggest that users of these tools must be aware of this potential dissociation. Understanding when and why semantic alignment can differ from local neighborhood preservation is crucial for accurate interpretation of visualizations. This implies that the choice of dimensionality reduction algorithm and its parameters must explicitly consider whether the primary goal is semantic grouping or fidelity to the original neighborhood structure, and how these two properties interact in the resulting visualization.

NASA outlines CSDA program goals and activities for 2026

NASA has provided an update on its Cloud Scientific Data Architecture (CSDA) program for 2026. The primary goal of this program is to enhance the accessibility and usability of the agency's scientific data through the implementation of cloud-based solutions. The CSDA initiative aims to optimize the management, storage, and distribution of vast volumes of data generated by Earth observation missions and other scientific research, thereby facilitating its analysis by the global scientific community. Among the key developments highlighted for 2026 is the launch of a new Calibration and Validation (Cal/Val) initiative. This initiative is crucial for ensuring the quality and reliability of collected scientific data, establishing rigorous protocols for instrument and model verification and adjustment. Cal/Val is fundamental to maintaining the accuracy of measurements and ensuring that results derived from NASA data are robust and consistent, which in turn strengthens the credibility of the scientific research that utilizes them.

Early Signs of Autumn Color Change in Nunavut Tundra

Tundra landscapes in Nunavut, Canada, are beginning to display the first signs of autumn, with the emergence of red, yellow, and orange hues. This phenomenon, which precedes the fall foliage season in more temperate latitudes, is a visual indicator of the seasonal cycle in Arctic regions. Although the news is brief, it highlights the early arrival of chromatic changes in these ecosystems, where vegetation reacts to variations in light and temperature earlier than in other geographical areas. The autumn coloration in the tundra is primarily due to the degradation of chlorophyll, the dominant green pigment during summer, revealing other pigments such as carotenoids (yellows and oranges) and anthocyanins (reds and purples) that were already present or are produced in response to environmental conditions. In these latitudes, dominant vegetation includes mosses, lichens, dwarf shrubs, and some grasses, which undergo these color changes synchronously. This process is crucial for plants to prepare for the imminent Arctic winter, allowing them to reabsorb nutrients from their leaves before they die or shed.

Reconstrucción superficial con H₂S mejora la eficiencia de QLEDs de CsPbI₃

Investigadores han desarrollado una técnica para mejorar significativamente la eficiencia de los diodos emisores de luz de puntos cuánticos (QLEDs) basados en perovskitas de haluro de cesio-plomo (CsPbI₃). El método implica la reconstrucción de la superficie de los puntos cuánticos de CsPbI₃ mediante la exposición a sulfuro de hidrógeno (H₂S). Esta modificación superficial reduce drásticamente la densidad de defectos en la interfaz de la capa emisora, lo que a su vez minimiza la pérdida de energía no radiativa y el efecto de "roll-off" (caída de eficiencia a altas corrientes). El tratamiento con H₂S provoca la formación de una capa de PbS en la superficie de los puntos cuánticos de CsPbI₃, que actúa como una capa pasivadora. Esta pasivación superficial es crucial porque los defectos en la superficie de los puntos cuánticos son una fuente principal de recombinación no radiativa, que disipa la energía en forma de calor en lugar de luz. La eliminación de estos defectos permite que los QLEDs operen con una mayor eficiencia cuántica externa (EQE) y mantengan esta eficiencia incluso a densidades de corriente elevadas, lo que es esencial para aplicaciones prácticas en pantallas y sistemas de iluminación. Los dispositivos resultantes demostraron una EQE máxima del 25,6%, un valor notablemente alto para QLEDs de perovskita roja. Además, exhibieron un "roll-off" ultrabajo, manteniendo una EQE del 20,1% a una luminancia de 1000 cd m⁻². Estos resultados representan un avance importante en la tecnología de QLEDs de perovskita, superando algunas de las limitaciones clave que han impedido su adopción generalizada. La capacidad de controlar y reducir los defectos superficiales es un paso crítico hacia la producción de dispositivos optoelectrónicos más eficientes y estables. Este trabajo abre nuevas vías para la ingeniería de superficies en puntos cuánticos de perovskita, sugiriendo que tratamientos químicos específicos pueden ser una estrategia efectiva para optimizar el rendimiento de los dispositivos. Las implicaciones van más allá de los QLEDs, pudiendo aplicarse a otras tecnologías basadas en perovskitas, como células solares y fotodetectores, donde la calidad de la superficie y la pasivación de defectos son igualmente importantes. Se espera que futuras investigaciones exploren la estabilidad a largo plazo de estos dispositivos y la aplicabilidad de este método a otras composiciones de perovskitas.

NewsPhysics: Quiz of the Week

This week, NewsPhysics presents a short quiz to assess our readers' knowledge of the latest developments in physics. The initiative aims to encourage participation and interest in recent scientific advancements, covering various areas of contemporary physics. The quiz is designed for a mixed audience, from university students to professional physicists and intelligent curious individuals, maintaining an accessible yet rigorous tone. The topics covered reflect the diversity and cutting-edge nature of current physics research, promoting a deeper understanding of the discoveries and developments shaping the future of science. We encourage all our readers to participate and test their knowledge, offering an opportunity to reflect on the breadth and depth of modern physics. The quiz results, while not published individually, will serve as a tool for participants to evaluate their own familiarity with the current landscape of physics research.

The Mystery of Foraminifera That Flip Their Spirals Every Few Millennia

An evolutionary enigma has captured scientists' attention: the periodic reversal in the coiling direction of foraminifera shells, single-celled marine organisms. This phenomenon, observed in fossil records, suggests a rarely seen evolutionary process playing out on a planetary scale. The central question is why these creatures alternate their chirality, a genetically determined trait, so regularly over thousands of years. Understanding this mechanism could shed light on how organisms adapt to long-term environmental changes and how natural selection operates on geological timescales. Foraminifera are crucial for paleoclimatology, as their calcium carbonate shells record past ocean conditions. The direction of their coiling (dextral or sinistral) is a genetic trait that, in many species, remains stable. However, in certain populations, a systematic change every few millennia has been documented. This pattern does not seem to correlate directly with known climatic fluctuations, ruling out a simple response to direct environmental factors. The current hypothesis suggests it might be a frequency-dependent selection cycle, where the advantage of a particular chirality changes as its proportion in the population varies. The study of this phenomenon involves analyzing thousands of foraminifera fossils extracted from marine sediment cores. Using dating and morphometric techniques, researchers can reconstruct the coiling history of these populations over millions of years. The data reveal that the reversal is not random but follows a quasi-periodic pattern, pointing to a complex underlying mechanism operating across generations. This type of evolutionary oscillation is rare to observe in the fossil record and could represent an example of coevolution or an intrinsic population dynamic not yet fully understood. The implications of this discovery extend beyond foraminifera biology. It could offer a model for understanding how other organisms with longer lifespans or less complete fossil records respond to long-term selective pressures. Furthermore, identifying the factors driving these chiral reversals could provide new tools for interpreting past environmental changes and predicting future evolutionary responses. Future research will focus on genetically modeling these dynamics and seeking possible correlations with large-scale biogeochemical cycles or ecological interactions.

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Lord Kelvin: Pioneer of Thermodynamics and the Absolute Temperature Scale

William Thomson, better known as Lord Kelvin, was a central figure in 19th-century physics, whose contributions ranged from thermodynamics to engineering. His most enduring legacy is the absolute temperature scale that bears his name, the Kelvin scale, which established absolute zero as the point at which molecular motion completely ceases. This concept was fundamental to the development of statistical physics and the understanding of energy at a fundamental level. Kelvin formulated the second law of thermodynamics in a way that emphasized the impossibility of a perfect heat engine, an idea that had profound implications for energy efficiency and the natural direction of physical processes. His work in thermodynamics not only unified concepts of heat and energy but also laid the groundwork for future research in cryogenics and low-temperature physics. In addition to his theoretical work, Kelvin was a prolific inventor and a practical engineer, involved in ambitious projects such as the laying of transatlantic telegraph cables, where he applied his knowledge of electricity and magnetism to overcome unprecedented technical challenges. His investigations into the age of the Earth, though erroneous in their estimation due to the lack of knowledge about radioactivity, demonstrated his scientific rigor in attempting to apply physical principles to geological problems. The breadth of his interests and the depth of his contributions solidify him as one of the most influential scientists of his era, whose work remains relevant to modern physics and engineering.

Modelos atomísticos predictivos para la conductividad térmica de materiales

Un nuevo estudio ha desarrollado un marco computacional que permite predecir con alta precisión la conductividad térmica de diversos materiales a partir de sus propiedades fundamentales a escala atómica. Este avance es crucial para el diseño y la optimización de materiales en campos tan variados como la electrónica, la energía y la ciencia de materiales, donde el control del flujo de calor es un factor determinante. La capacidad de predecir este parámetro sin necesidad de costosos y laboriosos experimentos abre una nueva vía para la ingeniería de materiales con propiedades térmicas a medida. Tradicionalmente, la determinación de la conductividad térmica ha dependido en gran medida de mediciones experimentales o de simulaciones computacionales que requieren un ajuste empírico significativo. El nuevo enfoque se basa en modelos atomísticos de primeros principios, lo que significa que las predicciones se derivan directamente de las interacciones fundamentales entre los átomos, sin parámetros ajustables. Esto representa un salto cualitativo, ya que permite explorar un vasto espacio de materiales y composiciones de manera eficiente, identificando candidatos prometedores antes de la síntesis experimental. El trabajo aborda una limitación clave en la ciencia de materiales, donde la relación entre la estructura atómica y las propiedades macroscópicas no siempre es trivial. El método combina la teoría de la perturbación de fonones con técnicas avanzadas de muestreo y cálculo de propiedades de transporte. Los investigadores aplicaron este marco a una amplia gama de materiales, incluyendo semiconductores, aislantes y aleaciones, obteniendo resultados que concuerdan notablemente con los datos experimentales existentes. La precisión alcanzada, a menudo dentro de un pequeño porcentaje de error respecto a los valores medidos, valida la robustez del modelo y su potencial para guiar el descubrimiento de nuevos materiales. Además, el marco es lo suficientemente flexible como para incorporar efectos complejos como la dispersión de fonones por defectos o límites de grano, lo que amplía su aplicabilidad a materiales más complejos. Las implicaciones de esta investigación son amplias. En la electrónica, podría acelerar el desarrollo de dispositivos más eficientes en la disipación de calor. En energía, facilitaría el diseño de materiales termoeléctricos para la conversión de calor residual en electricidad o aislantes más eficaces. A largo plazo, este tipo de herramientas computacionales predictivas son fundamentales para la ciencia de materiales basada en datos y la inteligencia artificial, permitiendo una exploración sistemática del espacio de materiales que va más allá de la intuición o la experimentación tradicional. El siguiente paso será integrar estos modelos en plataformas de diseño de materiales automatizadas para acelerar aún más el ciclo de descubrimiento.

Pacific Records Unusual Tropical Cyclone Activity

The Pacific Ocean has experienced a period of notable cyclonic activity, with the simultaneous formation of multiple tropical cyclones. This phenomenon contrasts with the relative calm observed in the Atlantic basin during the same period, highlighting the regional atmospheric and oceanic dynamics that influence the genesis and development of these storms. The observation of a trio of active tropical cyclones in the Pacific is an event that captures the interest of meteorologists and climatologists. These weather systems, characterized by strong winds and intense rainfall, pose significant challenges for coastal regions and maritime navigation. Their study is crucial for improving prediction models and disaster preparedness.

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NASA Sounding Rockets Reveal Internal Structure of Sporadic E Layers

A new study, based on data from NASA sounding rockets, has for the first time revealed the internal structure of sporadic E layers, plasma metallic "clouds" that form in Earth's upper atmosphere. These layers, composed of vaporized meteoritic dust, are known for their unpredictable appearance and dissipation, and can interfere with radio and GPS signals. The research offers an unprecedented insight into how these formations affect communications and the ionosphere. Sounding rockets, suborbital vehicles designed for short-duration research missions, allowed scientists to take multipoint measurements within these layers. By launching multiple instruments through the same sporadic E layer, a detailed profile of its density and composition could be obtained. This method has been crucial for understanding the spatial and temporal variability of these layers, which until now could only be observed remotely or with single-point measurements. The results of this mission are fundamental for improving models of Earth's ionosphere and more accurately predicting communication disruptions. Understanding the dynamics of sporadic E layers not only has implications for navigation and radio transmissions, but also contributes to the study of how near-Earth space interacts with the upper atmosphere, a critical area of research for space weather.

Greenland Iceberg Collides With Island in Nares Strait

In the summer of 2026, a substantial iceberg calved from the Petermann Glacier, located in northwest Greenland. This natural event led to the iceberg rapidly drifting into the Nares Strait, a crucial waterway separating Ellesmere Island from Greenland. During its trajectory, the iceberg collided with an island, an event that has been monitored by the scientific community. The Petermann Glacier is known for its iceberg calving dynamics, being one of Greenland's largest and most active glaciers. Such events are of interest to glaciologists and climatologists as they provide data on the stability of polar ice sheets and their contribution to sea-level rise. The collision with the island in the Nares Strait adds an element of geophysical interaction to iceberg drift, which can influence its fragmentation and the dispersion of ice remnants.

Coupling Opinion Dynamics and Epidemiology: A New Model

A new study proposes a model that couples opinion dynamics with epidemiology, offering a tool to understand how information and beliefs influence disease spread. This approach is crucial in a context where public response to health measures, such as vaccination or mask-wearing, is strongly mediated by perception and social acceptance. The research aims to go beyond traditional epidemiological models, which often assume uniform population behavior, to integrate the heterogeneity of individual and collective responses. The developed model considers how the dissemination of information, both accurate and misinformation, can alter individual decisions regarding the adoption of preventive behaviors. For example, the perception of disease risk or trust in a vaccine can vary significantly among different social groups, which in turn affects the contagion rate and the effectiveness of public health interventions. This framework allows for the exploration of complex scenarios where the interaction between circulating information and disease evolution creates feedback loops. The researchers have used this model to simulate various scenarios, analyzing how different communication strategies or opinion polarization can impact an epidemic's trajectory. The results suggest that a deep understanding of opinion dynamics is as vital as biological knowledge of the disease for designing effective public health responses. The ability to predict and mitigate the impact of misinformation is presented as a key challenge for future pandemics. This work opens new avenues for interdisciplinary research, merging statistical physics and sociology with epidemiology. It is expected that the model can be adapted to study other interactions between social and biological phenomena, and that its predictions can inform more robust and adaptive public policies in the face of health crises. Validation of the model with empirical data from past outbreaks will be a crucial step in its future development.

NASA Astronaut Jonny Kim Returns to Active Military Service

NASA astronaut Jonny Kim has concluded his service with the space agency after nearly a decade, to rejoin the U.S. Navy as a lieutenant commander. Kim, who was selected as an astronaut in 2017, is known for his exceptional background, having previously served as a Navy SEAL and an emergency physician. During his tenure at NASA, Kim completed an eight-month scientific expedition aboard the International Space Station (ISS). His mission to the ISS began in April 2025, when he launched aboard the Soyuz MS-27 spacecraft. On the station, he participated in various scientific investigations and maintenance operations, contributing to the space exploration program. Kim's departure highlights the flexibility and commitment of astronauts to both their military and scientific careers. His return to active duty in the U.S. Navy represents a shift in focus from space exploration to military responsibilities, although his experience as an astronaut and physician will remain a valuable asset.

The Forested Floodplains of Congaree National Park

Congaree National Park is home to a unique floodplain forest ecosystem, shaped by the meandering Congaree River. This river is fundamental for sustaining towering forests and forming oxbow lakes, which are U-shaped bodies of water created when a wide meander of a river is cut off from the main stream. The fluvial dynamics of the Congaree are a key example of how hydrological processes can sculpt landscapes and support exceptional biodiversity in floodplain environments. The continuous interaction between the river and its floodplain is an active geomorphological process. As the Congaree River shifts across its plain, it deposits sediments and erodes its banks, contributing to the formation and evolution of these oxbow lakes and the renewal of forest soils. This dynamic of periodic floods and changes in the river's course is essential for the health and resilience of the forest ecosystem, which adapts to these natural cycles. Understanding these processes is crucial for the management and conservation of these valuable habitats.

Microscopio de rayos X capta ondas de espín en acción

Científicos han desarrollado un microscopio de rayos X capaz de visualizar directamente las ondas de espín, también conocidas como magnones, en materiales magnéticos. Este avance permite observar interacciones no lineales de los magnones, un paso crucial para el desarrollo de la espintrónica y la computación basada en ondas. La técnica, que utiliza pulsos de rayos X ultracortos, abre nuevas vías para comprender y manipular estos fenómenos cuánticos a escalas nanométricas y temporales ultrarrápidas. Los magnones son excitaciones colectivas de los espines de los electrones en un material magnético, comportándose como cuasipartículas. Su potencial para transmitir y procesar información con menor disipación de energía que los electrones convencionales los convierte en candidatos prometedores para una nueva generación de dispositivos electrónicos. Sin embargo, la observación directa de sus dinámicas, especialmente sus interacciones no lineales, ha sido un desafío técnico significativo debido a su escala y velocidad. El nuevo microscopio emplea pulsos de rayos X de sincrotrón para sondear la magnetización local de una muestra con una resolución espacial y temporal sin precedentes. Al analizar la dispersión de estos rayos X, los investigadores pueden reconstruir el patrón de las ondas de espín y cómo interactúan entre sí. Esta capacidad es fundamental para estudiar fenómenos como la mezcla de cuatro ondas o la generación de armónicos, que son la base de las operaciones lógicas en dispositivos magnónicos. La técnica permite una caracterización detallada de la propagación de magnones y sus propiedades de amortiguamiento. Este logro experimental no solo valida modelos teóricos de la dinámica de magnones, sino que también proporciona una herramienta esencial para la ingeniería de dispositivos espintrónicos. La capacidad de visualizar y controlar interacciones no lineales podría llevar a la creación de transistores magnónicos, memorias de alta densidad y procesadores de información que operen a frecuencias de terahercios, superando las limitaciones de la electrónica actual basada en la carga del electrón. El siguiente paso será aplicar esta microscopía para investigar nuevos materiales magnéticos y arquitecturas de dispositivos.

NASA Welcomes Jeret Howard as Civil Servant at Stennis

Jeret Howard, a U.S. Army veteran, has been hired as a civil servant by NASA's Stennis Space Center, located near Bay St. Louis, Mississippi. This appointment is part of an agency directive to restore core competencies within its workforce. Howard, who served as a combat medic in Iraq at age 17, now joins NASA's civil workforce, transitioning from his previous role as a contractor. This move by NASA highlights an effort to strengthen its internal capabilities and reduce reliance on external personnel in key areas. Howard's background, from his military service to his prior experience as a contractor, aligns with the agency's strategy to integrate talent with diverse skills and experiences. His hiring exemplifies how NASA seeks to consolidate its team to address future challenges in space exploration and research.

US Orders Universities to Audit Foreign Research Ties

The U.S. Department of Defense has issued a directive requiring 30 research universities across the country to audit their collaborations and ties with foreign research entities. This measure is part of a broader effort to safeguard national security and protect intellectual property and sensitive technology developed with federal funding. The order underscores the growing concern of the U.S. government regarding the transfer of critical knowledge and technologies to foreign powers, especially in strategic research areas. The directive implies that universities will need to thoroughly review funding agreements, joint projects, personnel exchanges, and any other form of collaboration with international institutions and governments. The goal is to identify and mitigate potential risks associated with foreign interference or economic espionage. This initiative could significantly impact how U.S. universities manage their international relationships and the transparency of their research programs.

Astronaut Reid Wiseman Participates in Freedom 250 Grand Prix

NASA astronaut and Artemis II commander Reid Wiseman participated in the Freedom 250 Grand Prix, held on Sunday, August 23, 2026, in Washington D.C. Wiseman was seen in a two-seater IndyCar, preparing for a lap with driver Conor Daly before the start of the race. This event highlights the continued public visibility of NASA astronauts and their involvement in high-profile activities. Wiseman's presence at a major sporting event like this is part of NASA's initiatives to connect with the public and generate excitement around its space missions, especially the Artemis II mission. This mission, which will carry a crew around the Moon, represents a crucial step in humanity's return to the lunar surface and preparation for future explorations to Mars. The participation of key figures like Wiseman in public events helps maintain focus on the space agency's goals and achievements.

NASA Johnson Space Center Photographers Document Space Exploration

Photographers at NASA’s Johnson Space Center (JSC) in Houston have been responsible for immortalizing some of the most significant moments in the history of human spaceflight. Their work ranges from astronaut training and engineering equipment tests, to mission control operations and milestone celebrations. These images not only preserve the history of space exploration but also capture the people and teams who make possible the missions defining the next era of human adventure in space.

Hurricane Lala Batters Hawaii with Torrential Rains and Strong Winds

Hurricane Lala, a Category 1 storm, has impacted the state of Hawaii, bringing extreme rainfall and damaging winds. The storm passed over the Island of Hawaii, leaving severe weather conditions in its wake that affected the region. Such extreme meteorological phenomena are subjects of study in various branches of physics, including fluid dynamics and atmospheric thermodynamics. Understanding the formation and evolution of hurricanes is crucial for improving prediction models and mitigating their effects.

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New method to measure volatility of cryptocurrencies and commodities

A recent study has developed a new method to analyze volatility and contagion effects between cryptocurrencies and commodities, especially during periods of economic instability. The research focuses on how fluctuations in one market can spread to others, a phenomenon known as "spillover" or contagion effect. This approach is crucial for understanding the interconnectedness of financial and digital asset markets, which have shown increasing interdependence in recent years. The proposed method uses a multivariate conditional volatility model, which allows capturing the dynamics of interactions between different assets over time. Unlike traditional models that assume constant volatility or a linear relationship, this new approach can identify changes in the intensity and direction of contagion effects in response to external events, such as economic crises or regulatory changes. The results obtained with this model offer a more precise view of how shocks are transmitted between these markets. This advance has significant implications for both investors and regulators. By being able to better quantify and predict the spread of volatility, investors can make more informed decisions about portfolio diversification and risk management. For regulators, the method provides a valuable tool for monitoring financial stability and designing policies that mitigate systemic risks arising from the interconnection between cryptocurrency and commodity markets. The ability to identify periods of high contagion is fundamental to preventing broader financial crises.

Volunteer Develops AI Tool to Identify Rare Clouds in Space Cloud Watch Project

A volunteer has developed a machine-learning tool to identify specific types of clouds that are exhibiting anomalous behavior. These clouds, which are appearing more frequently and at lower altitudes than usual, are under study in the NASA-supported Space Cloud Watch project. The aim of this initiative is to understand the factors influencing these changes in cloud formation. To this end, the Space Cloud Watch project collects images of these atmospheric formations submitted by citizens worldwide, thereby contributing to scientific research on Earth's climate and atmosphere.

Spontaneous Magnetic Skyrmions Stable at Elevated Temperatures in Doped CrTe

Researchers have observed the spontaneous emergence of magnetic skyrmions in a boron-doped chromium telluride (CrTe) alloy, and significantly, have demonstrated their stability at temperatures above room temperature. This finding represents a crucial advance, as most known materials supporting skyrmions require cryogenic conditions or applied magnetic fields for their formation and stability, limiting their potential for technological applications. The ability to generate and maintain these topological structures at elevated temperatures opens new avenues for the development of next-generation spintronic devices and data storage. Skyrmions are magnetic quasiparticles with a knot-like topology, characterized by their small size (tens of nanometers), high stability, and the ease with which they can be manipulated by low-density electrical currents. These properties make them attractive for computing and information storage, where they could replace conventional magnetic bits, offering higher data density and lower energy consumption. However, the temperature barrier has been a significant obstacle to their practical implementation. The research team utilized advanced magnetic force microscopy techniques to characterize the formation and behavior of skyrmions in the boron-doped CrTe. They demonstrated that the addition of boron modifies the magnetic interactions within the material, favoring the spontaneous appearance of these topological structures without the need for external magnetic fields. The observed stability at temperatures above room temperature, up to approximately 100 °C, is a milestone that overcomes the limitations of other known materials. This advance suggests that CrTe-based materials could be promising candidates for future spintronic technologies, paving the way for the manufacture of more efficient and compact magnetic memories and logic.

Cascade Volcanoes Shrouded in Wildfire Smoke

Astronauts aboard the International Space Station (ISS) have captured images of Mount Hood and Mount Rainier, two prominent volcanoes in the Cascade Range, enveloped in a dense layer of smoke. This phenomenon was observed during the summer of 2026, when a wave of wildfires severely affected the Pacific Northwest region of the United States. The photographs taken from Earth's orbit provide a unique perspective on the magnitude of smoke dispersion, which covered vast geographical areas, including these significant geological formations. Although the news focuses on the visual observation, it highlights the growing concern about the impact of large-scale wildfires on the environment and air quality in densely populated regions with sensitive ecosystems.