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By NASA
4 Min Read Science in Orbit: Results Published on Space Station Research in 2024
NASA and its international partners have hosted research experiments and fostered collaboration aboard the International Space Station for over 25 years. More than 4,000 investigations have been conducted, resulting in over 4,400 research publications with 361 in 2024 alone. Space station research continues to advance technology on Earth and prepare for future space exploration missions.
Below is a selection of scientific results that were published over the past year. For more space station research achievements and additional information about the findings mentioned here, check out the 2024 Annual Highlights of Results.
Making stronger cement
NASA’s Microgravity Investigation of Cement Solidification (MICS) observes the hydration reaction and hardening process of cement paste on the space station. As part of this experiment, researchers used artificial intelligence to create 3D models from 2D microscope images of cement samples formed in microgravity. Characteristics such as pore distribution and crystal growth can impact the integrity of any concrete-like material, and these artificial intelligence models allow for predicting internal structures that can only be adequately captured in 3D. Results from the MICS investigation improve researchers’ understanding of cement hardening and could support innovations for civil engineering, construction, and manufacturing of industrial materials on exploration missions.
European Space Agency (ESA) astronaut Alexander Gerst works on the Microgravity Investigation of Cement Solidification (MICS) experiment in a portable glovebag aboard the International Space Station.NASA Creating Ideal Clusters
The JAXA (Japan Aerospace Exploration Agency) Colloidal Clusters investigation uses the attractive forces between oppositely charged particles to form pyramid-shaped clusters. These clusters are a key building block for the diamond lattice, an ideal structure in materials with advanced light-manipulation capabilities. Researchers immobilized clusters on the space station using a holding gel with increased durability. The clusters returned to Earth can scatter light in the visible to near-infrared range used in optical and laser communications systems. By characterizing these clusters, scientists can gain insights into particle aggregation in nature and learn how to effectively control light reflection for technologies that bend light, such as specialized sensors, high-speed computing components, and even novel cloaking devices.
A fluorescent micrograph image shows colloidal clusters immobilized in gel. Negatively charged particles are represented by green fluorescence, and positively charged particles are red. JAXA/ Nagoya City University Controlling Bubble Formation
NASA’s Optical Imaging of Bubble Dynamics on Nanostructured Surfaces studies how different types of surfaces affect bubbles generated by boiling water on the space station. Researchers found that boiling in microgravity generates larger bubbles and that bubbles grow about 30 times faster than on Earth. Results also show that surfaces with finer microstructures generate slower bubble formation due to changes in the rate of heat transfer. Fundamental insights into bubble growth could improve thermal cooling systems and sensors that use bubbles.
High-speed video shows dozens of bubbles growing in microgravity until they collapse.Tengfei Luo Evaluating Cellular Responses to Space
The ESA (European Space Agency) investigation Cytoskeleton attempts to uncover how microgravity impacts important regulatory processes that control cell multiplication, programmed cell death, and gene expression. Researchers cultured a model of human bone cells and identified 24 pathways that are affected by microgravity. Cultures from the space station showed a reduction of cellular expansion and increased activity in pathways associated with inflammation, cell stress, and iron-dependent cell death. These results help to shed light on cellular processes related to aging and the microgravity response, which could feed into the development of future countermeasures to help maintain astronaut health and performance.
Fluorescent staining of cells from microgravity (left) and ground control (right).ESA Improving Spatial Awareness
The CSA (Canadian Space Agency) investigation Wayfinding investigates the impact of long-duration exposure to microgravity on the orientation skills in astronauts. Researchers identified reduced activity in spatial processing regions of the brain after spaceflight, particularly those involved in visual perception and orientation of spatial attention. In microgravity, astronauts cannot process balance cues normally provided by gravity, affecting their ability to perform complex spatial tasks. A better understanding of spatial processes in space allows researchers to find new strategies to improve the work environment and reduce the impact of microgravity on the spatial cognition of astronauts.
An MRI (magnetic resonance imaging) scan of the brain shows activity in the spatial orientation regions.NeuroLab Monitoring low Earth orbit
The Roscomos-ESA-Italian Space Agency investigation Mini-EUSO (Multiwavelength Imaging New Instrument for the Extreme Universe Space Observatory) is a multipurpose telescope designed to examine light emissions entering Earth’s atmosphere. Researchers report that Mini-EUSO data has helped to develop a new machine learning algorithm to detect space debris and meteors that move across the field of view of the telescope. The algorithm showed increased precision for meteor detection and identified characteristics such as rotation rate. The algorithm could be implemented on ground-based telescopes or satellites to identify space debris, meteors, or asteroids and increase the safety of space activities.
The Mini-EUSO telescope is shown in early assembly.JEM-EUSO Program For more space station research achievements and additional information about the findings mentioned here, check out the 2024 Annual Highlights of Results.
Destiny Doran
International Space Station Research Communications Team
Johnson Space Center
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By NASA
4 min read
Preparations for Next Moonwalk Simulations Underway (and Underwater)
A new international study partially funded by NASA on how Mars got its iconic red color adds to evidence that Mars had a cool but wet and potentially habitable climate in its ancient past.
Mosaic of the Valles Marineris hemisphere of Mars projected into point perspective, a view similar to that which one would see from a spacecraft. The distance is 2500 kilometers from the surface of the planet, with the scale being .6km/pixel. The mosaic is composed of 102 Viking Orbiter images of Mars. The center of the scene (lat -8, long 78) shows the entire Valles Marineris canyon system, over 2000 kilometers long and up to 8 kilometers deep, extending form Noctis Labyrinthus, the arcuate system of graben to the west, to the chaotic terrain to the east. Many huge ancient river channels begin from the chaotic terrain from north-central canyons and run north. The three Tharsis volcanoes (dark red spots), each about 25 kilometers high, are visible to the west. South of Valles Marineris is very ancient terrain covered by many impact craters.NASA The current atmosphere of Mars is too cold and thin to support liquid water, an essential ingredient for life, on its surface for lengthy periods. However, various NASA and international missions have found evidence that water was abundant on the Martian surface billions of years ago during a more clement era, such as features that resemble dried-up rivers and lakes, and minerals that only form in the presence of liquid water.
Adding to this evidence, results from a study published February 25 in the journal Nature Communications suggest that the water-rich iron mineral ferrihydrite may be the main culprit behind Mars’ reddish dust. Martian dust is known to be a hodgepodge of different minerals, including iron oxides, and this new study suggests one of those iron oxides, ferrihydrite, is the reason for the planet’s color.
The finding offers a tantalizing clue to Mars’ wetter and potentially more habitable past because ferrihydrite forms in the presence of cool water, and at lower temperatures than other previously considered minerals, like hematite. This suggests that Mars may have had an environment capable of sustaining liquid water before it transitioned from a wet to a dry environment billions of years ago.
“The fundamental question of why Mars is red has been considered for hundreds if not for thousands of years,” said lead author Adam Valantinas, a postdoctoral fellow at Brown University, Providence, Rhode Island, who started the work as a Ph.D. student at the University of Bern, Switzerland. “From our analysis, we believe ferrihydrite is everywhere in the dust and also probably in the rock formations, as well. We’re not the first to consider ferrihydrite as the reason for why Mars is red, but we can now better test this using observational data and novel laboratory methods to essentially make a Martian dust in the lab.”
Laboratory sample showing simulated Martian dust. The ochre color is characteristic of iron-rich ferrihydrite, a mineral that provides crucial insights into ancient water activity and environmental conditions on Mars. The fine-powder mixture consists of ferrihydrite and ground basalt with particles less than one micrometer in size (1/100th diameter of a human hair) (Sample scale: 1 inch across).Adam Valantinas “These new findings point to a potentially habitable past for Mars and highlight the value of coordinated research between NASA and its international partners when exploring fundamental questions about our solar system and the future of space exploration,” said Geronimo Villanueva, the Associate Director for Strategic Science of the Solar System Exploration Division at NASA’s Goddard Space Flight Center in Greenbelt, Maryland, and co-author of this study.
The researchers analyzed data from multiple Mars missions, combining orbital observations from instruments on NASA’s Mars Reconnaissance Orbiter, ESA’s (the European Space Agency) Mars Express and Trace Gas Orbiter with ground-level measurements from NASA rovers like Curiosity, Pathfinder, and Opportunity. Instruments on the orbiters and rovers provided detailed spectral data of the planet’s dusty surface. These findings were then compared to laboratory experiments, where the team tested how light interacts with ferrihydrite particles and other minerals under simulated Martian conditions.
“What we want to understand is the ancient Martian climate, the chemical processes on Mars — not only ancient — but also present,” said Valantinas. “Then there’s the habitability question: Was there ever life? To understand that, you need to understand the conditions that were present during the time of this mineral’s formation. What we know from this study is the evidence points to ferrihydrite forming and for that to happen there must have been conditions where oxygen from air or other sources and water can react with iron. Those conditions were very different from today’s dry, cold environment. As Martian winds spread this dust everywhere, it created the planet’s iconic red appearance.”
Whether the team’s proposed formation model is correct could be definitively tested after samples from Mars are delivered to Earth for analysis.
“The study really is a door-opening opportunity,” said Jack Mustard of Brown University, a senior author on the study. “It gives us a better chance to apply principles of mineral formation and conditions to tap back in time. What’s even more important though is the return of the samples from Mars that are being collected right now by the Perseverance rover. When we get those back, we can actually check and see if this is right.”
Part of the spectral measurements were performed at NASA’s Reflectance Experiment Laboratory (RELAB) at Brown University. RELAB is supported by NASA’s Planetary Science Enabling Facilities program, part of the Planetary Science Division of NASA’s Science Mission Directorate at NASA Headquarters in Washington.
By William Steigerwald
NASA Goddard Space Flight Center, Greenbelt, Maryland
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Last Updated Feb 24, 2025 EditorWilliam SteigerwaldContactLonnie Shekhtmanlonnie.shekhtman@nasa.govLocationNASA Goddard Space Flight Center Related Terms
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The latest analysis from the European Space Agency (ESA) Planetary Defence Office has reduced the probability that asteroid 2024 YR4 might impact Earth in 2032 to 0.001%.
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By NASA
Explore This SectionEarth Home Earth Observer Home Editor’s Corner Feature Articles Meeting Summaries NewsScience in the News Calendars In Memoriam MoreArchives 3 min read
In Memoriam: Jeff Dozier [1944–2024]
Jeff Dozier [1944–2024]Photo credit: Dozier’s family obituary Jeff Dozier, an environmental scientist, snow hydrologist, researcher, academic – and former Earth Observing System Project Scientist – died on November 17, 2024. Jeff’s research focused on snow hydrology and biogeochemistry in mountain environments and addressed the role of stored and melting snow in the hydrologic cycle as well as the economic and social impact on water resources. In these efforts, he embraced remote sensing with satellites to measure snow properties and energy balance. He was a Project Scientist with the Earth Observing System (EOS) Data and Information System, contributing to the design and management of very large information systems that would impact spatial modeling and environmental informatics.
Jeff served as the second EOS Project Scientist from 1990–1992. During that time, he worked with the NASA science community to – in his own words – “accomplish the goals of EOS, the most important of which is to develop the capability to predict or assess plausible environmental changes – both natural and human-induced – that will occur in the future. Meeting this challenge for the next decade to century requires the integration of knowledge from the traditional disciplines and information from many different sources into a coherent view of the Earth system. EOS is the largest project in the history of NASA and arguably the most important national and international scientific mission of the next two decades.”
Jeff’s work alongside Michael Matson, was featured in a 2019 NASA Earth Science news article: “NASA Tracks Wildfires From Above to Aid Firefighters Below.” While working at NOAA’s National Environmental Satellite, Data, and Information Service building in Camp Springs, MD, the pair detected methane fires in the Persian Gulf using the Advanced Very High Resolution Radiometer (AVHRR) instrument on the NOAA-6 satellite – marking the first time that such a small fire had been seen from space. Jeff went on to develop a mathematical method to distinguish small fires from other sources of heat, which become the foundation for nearly all subsequent satellite fire-detection algorithms.
At the time of his death, Jeff was Principal Investigator of a NASA-funded project with the objective of testing whether data from the Earth Surface Mineral Dust Source Investigation (EMIT) mission could be used to help refine the estimate for the snowpack melting rate. In the 2024 Earth Science news article, “NASA’s EMIT Will Explore Diverse Science Questions on Extended Mission,” Jeff indicated that EMIT’s ability to ‘see’ well into the infrared (IR) spectrum of light is key to his group’s efforts because ice is “pretty absorptive at near-IR and shortwave-IR wavelengths.” The results from this research will help inform water management decisions in states, such as California, where meltwater makes up the majority of the agricultural water supply.
Jeff earned a Bachelor’s of Science degree from California State University, Hayward (now California State University, East Bay) and a Master’s of Science degree and Ph.D. from the University of Michigan. He spent his career teaching at the University of California, Santa Barbara (UCSB), where he was named the founding Dean of the Bren School of Environmental Science and Management at UCSB in 1994. As the Dean, he recruited renowned faculty and developed one of the top environmental programs in the country. After his role as Dean, Jeff returned as a professor at Bren, educating the next generation of Earth scientists.
Jeff Dozier [1944–2024]Photo credit: Dozier’s family obituaryView the full article
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