Like tendrils on a vine, lava spreads out from the northern crater of Krasheninnikov, a volcano pair on the Pacific coast of Russia’s Kamchatka Peninsula. On July 30, 2025, an 8.8-magnitude earthquake had struck in the nearby ocean, apparently jolting one of the two volcanoes awake. A few days later, for the first time in nearly five centuries, Krasheninnikov started erupting. Since that day, the northern volcano has been spilling a steady, eastward-flowing field of molten rock and debris, and the NASA-ISRO Synthetic Aperture Radar (NISAR) mission has been tracking the changes in the landscape.

From its vantage point 464 miles (747 kilometers) above the surface, NISAR captured an image of Krasheninnikov on Dec. 25, 2025, just as the Earth-observing satellite was finishing post-launch checks and becoming operational. Twice every 12 days since — once as the satellite passed south to north, and again as it passed north to south — NISAR has returned to the same spot in orbit and taken detailed radar snapshots.

Researchers put 17 of the frames captured through mid-August into sequence, forming a time-lapse video that shows lava filling a smaller, inner caldera, then overflowing into a wider crater before widening into a fan. The animation highlights how NISAR’s observations can monitor the development of natural hazards, both for science and potentially for emergency response.

Though remote, many of Kamchatka’s dozens of volcanoes are closely monitored with ground instruments because they erupt frequently. Not so with Krasheninnikov, which has been quiet since about the year 1550. That NISAR’s L-band radar observed it at all speaks to the satellite’s near-global coverage of the planet’s land surface at resolutions in the dozens of feet; that it captured the erupting volcano over time shows the precision and reliability of its measurements.

“The consistency is crucial. Twice every 12 days, acquiring in this high-resolution mode and in two observation directions, this shows the promise of NISAR to closely monitor natural hazards,” said Matthew Pritchard, a member of the NISAR science team and geophysicist at Cornell University who analyzed the data used to create the animation. 

Images from microwaves

The detail in a single NISAR image results from the use of synthetic aperture radar, or SAR, a specialized processing technique pioneered by NASA’s Jet Propulsion Laboratory in Southern California for Earth observation from space. As the satellite orbits, the radar sends thousands of microwave pulses per second to Earth and receives the return signals, each of which is effectively a snapshot in time that contains information about the properties and characteristics of the surface below.

The SAR processing combines the many images of the same area, sharpening the view just as a lens brings a blurry object into focus. Each pixel in the individual frames of the Krasheninnikov time-lapse represents about a 30-foot-by-30-foot (10-meter-by-10-meter) square on the surface — about half the size of a tennis court.

Lava shows up lighter in the images due to the way that microwaves reflect more brightly compared with the surrounding surface, which, depending on the time of year, is either snow or bare ground. In addition to the lava field growing to the east, the video shows another flow to the northwest, one that likely formed before NISAR captured the first NISAR image.

When Pritchard was doing his doctoral research on Kamchatka volcanoes more than 20 years ago, analysis-ready radar data was difficult to come by, both because satellites didn’t revisit as often and the resolution of the images was relatively low.

Now in addition to getting frequent and comprehensive coverage of virtually all the planet’s roughly 1,300 active, above-sea-level volcanoes, the images are sharp down to the several-meter scale and are easily accessible via the cloud. 

“We’re seeing volcanoes around the world that we’ve never really had eyes on like this before,” said Pritchard.

The NISAR satellite is the first free-flying space mission to feature two radar instruments: an L-band system and an S-band system. The systems are complementary due to their differing wavelengths. For example, the longer-wave L-band can pass through tree canopies, imaging the ground beneath. Meanwhile, depending on leaf sizes, S-band can collect observations of those canopies.

The data products from the NISAR mission’s L-band radar are available at the Alaska Satellite Facility Distributed Active Archive Center in Fairbanks, which hosts and distributes all NASA synthetic aperture radar data.

More about NISAR

Managed by Caltech for NASA, JPL leads the United States component of the project and provided the satellite’s L-band SAR and antenna reflector. The spacecraft bus and its S-band SAR were provided by ISRO (Indian Space Research Organisation).

The NISAR satellite is the first to carry two SAR instruments at different wavelengths, collecting data using the spacecraft’s giant drum-shaped reflector, which measures 39 feet (12 meters) wide, which is the largest radar antenna reflector NASA has sent into space.

To learn more about NISAR, visit: 

https://science.nasa.gov/mission/nisar/

Media Contacts

Andrew Wang / Andrew Good 
Jet Propulsion Laboratory, Pasadena, Calif. 
626-379-6874 / 818-393-2433 
[email protected] / [email protected] 

2026-064

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In this Aug. 27, 2026, image, an Alta-X drone flies an advanced guidance and navigation system known as the Safe and Precise Landing – Integrated Capabilities Evolution (SPLICE) experiment near NASA’s Armstrong Flight Research Center in Edwards, California.

Researchers at NASA’s Johnson Space Center in Houston developed SPLICE, which successfully completed simulated lunar descent and landing maneuvers during recent testing. Its technologies provide safe and precise landing for the Moon, Mars, icy worlds, and other destinations using specialized navigation, guidance, and processing techniques. It enables landing in hard-to-reach and unknown areas that are of high scientific interest.

Image credit: NASA/Ryan Kline

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In 2021, Maine Beer Company’s carbon dioxide supplier ran short on carbon dioxide.

“There was potential for our beer to go stale in the tanks,” said Dave Love, the brewery’s sustainability manager. “We wouldn’t be able to use CO₂ for any of our bottling, kegging, or centrifuge operations.”

The solution the company settled on originated on Mars — or more specifically, in NASA’s plans for harvesting resources from the Red Planet. Now it’s saving money and reducing emissions for wineries, distilleries, power companies, helium producers, and more.

Beginning in the 1990s, the company Pioneer Astronautics won multiple Small Business Innovation Research (SBIR) contracts from Johnson Space Center in Houston to build systems that could generate resources on Mars. The technology could, for example, capture carbon dioxide from the Martian atmosphere and combine it with hydrogen to produce water for life support and methane for rocket fuel. These capabilities weren’t entirely new, but Pioneer’s systems were compact, efficient, and automated.

Later, Pioneer Astronautics founder Robert Zubrin created Pioneer Energy to rearrange these subsystems into technology for the oil and gas industry (Spinoff 2015, 2020). He soon realized technology for capturing and purifying carbon dioxide on Mars could do the same in a brewery, capturing CO₂ from the brewing process for use in carbonation. By 2015, the Craft Brewery Recovery System was in production (Spinoff 2016). In the end, though, the company put the system up for licensing.

Amy George founded Earthly Labs of Austin, Texas, in 2016 to develop small-scale carbon capture. She discovered the Craft Brewery Recovery System and obtained an exclusive license. 

Since the pandemic reduced its availability, carbon dioxide has continued experiencing shortages and volatility, and George said these have emerged as major drivers of interest in the technology. 

And it isn’t just helping brewers. After expanding into wineries and distilleries, Earthly Labs started discovering other markets. Energy companies often generate carbon dioxide as a by-product, which they can sell if it’s captured. Several are now customers.

Another application finding new customers is helium production. Helium, which is used to make microchips and fiber-optic cables, among other applications, is found in underground deposits, mixed with other gases, such as methane and carbon dioxide, that need to be separated. 

In 2021, Earthly Labs was acquired by Chart Industries Inc., which specializes in cryogenic equipment engineering and has helped scale up the technology for applications like power plants.

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NASA announced the winners of the Deep Space Food Challenge: Mars to Table Thursday, with the top $300,000 prize being awarded to Chinyere Ukeje of Philadelphia, Pa. for the Adaptive Nourishment Infrastructure (ANI) food system concept. This competition challenged solvers to explore innovative solutions for integrated space food systems that would provide safe, nutritious meals to astronauts living and working in space.   

Mars to Table launched in January 2026 as a follow on to the Deep Space Food Challenge, which NASA ran from 2021-2014 in collaboration with CSA (Canadian Space Agency). The original challenge focused on prototyped novel food production methods, while the 2026 competition asked teams to conceptualize space meals not as individual technology components, but as a complete food-production system that would offer a variety of food with limited crew time and work needed to maintain the food system. After judging 113 submissions by teams hailing from 33 countries and 28 U.S. states, the agency selected five winning teams for the 2026 challenge, awarding a combined $650,000. 

“We’re thrilled to keep advancing the future of space food systems with this challenge,” said Jennifer Edmunson, program manager for Centennial Challenges at NASA’s Marshall Space Flight Center in Huntsville, Alabama. “The future of human space exploration will rely on innovative food systems, and it is amazing how much ingenuity this challenge has helped us identify from participants near and far.” 

Currently, astronaut meals are almost entirely cooked, packaged, and sent to the International Space Station from the Space Food Systems Laboratory at NASA’s Johnson Space Center. A one-way trip to Mars will take at least nine months, so bringing all required meals will not be sustainable for such missions. From shelf stability issues to mass restrictions, pre-packaged foods cannot be the default option for future Martian astronauts.  

In search of viable solutions for future space food operations, teams were tasked with ideating and designing systems in response to a mission scenario that addressed a 15-person astronaut crew for 500 Martian sols, or about 513 Earth days. The challenge focused on surface operations and system integration, and each team delivered a design layout, meal plan, concept of operations, and walkthrough video. 

“The criteria we laid out for this competition were challenging, but intentionally so,” said Mars to Table head judge Dr. Alexander Meyers, who supports NASA Centennial Challenges through Noetic Strategies from the agency’s Kennedy Space Center in Florida. “This challenge spotlights the complexity of a complete space food system and the human ingenuity required to solve these problems. Every new idea presented in this challenge represents a possible new tool in NASA’s plans for the future of space exploration. 

NASA named five winners of the Mars to Table Challenge. These technologies provide NASA with inspirational launching pads for future deep space food systems. 

The first-place winner, Chinyere Ukeje, developed the concept of ANI, a modular food ecosystem combining controlled-environment agriculture, fermentation and fungi cultivation, and closed-loop nutrient recycling through bioreactors with limited Earth-provisioned foods to produce 50% of the food away from Earth. ANI, named after the Nigerian Earth goddess of harvest and fertility, envisions a system that cooks fresh meals daily and has provisions to work through shortages of power, water, equipment, or crew time. 

The second-place prize of $200,000 was awarded to Cislune of Rosemead, Calif. for the Fresh, Ferment, Reserve food infrastructure. The proposed system grows model-selected crops, converts part of the harvest into familiar foods in instrumented culture cassettes, and uses a protected Earth-loaded reserve to supplement in cases of biological variability, utility curtailment, and rejected batches. 

Additional prizes include: 

• Applied Frameworks Award ($50,000): Ohā Kanu from Hilo, Hawaii with ʻOhā Kanu: An Ahupuaʻa-Inspired Food System for Mars 

• Mission Simulation Award ($50,000): Orbital Health Systems, Inc. from Evansville, Ind. with New Lunar Settlers Cookbook (Mars Edition) 

• Human-Centered Design Award ($50,000): Autonomic Resilience Collective from Bentonville, Ark. with Adaptive Endurance and Growth through Integrated Sustenance (AEGIS) Mars 

NASA also recognized one international team: 

• International Winner: Astrofood from Ellezelles, Belgium with Food Resilience Ecosystem for Space Habitats (FRESH) 

The Deep Space Food Challenge: Mars to Table is managed at NASA Marshall by Centennial Challenges, part of the Prizes, Challenges, and Crowdsourcing Program within NASA’s Research and Technology Mission Directorate. The challenge is also supported by NASA’s Division of Biological and Physical Sciences, Heliophysics Division, Planetary Science Program, Human Research Program, and Earth Science Division.  

Centennial Challenges have a legacy of more than 20 years engaging the public to solve complex problems that benefit NASA’s broader initiatives. Past challenges have spurred advances in robotics, additive manufacturing, power and energy, textiles, chemistry, and biology.  

The Deep Space Food Challenge: Mars to Table is also supported by subject matter experts at NASA Johnson and NASA Kennedy. The Methuselah Foundation and Floor23 Digital support the administration of this challenge.  

To learn more about the challenge, visit: 

go.nasa.gov/marstotable  

Source: www.nasa.gov

NASA’s researchers know that when you settle into your seat on a commercial flight, you expect a smooth takeoff, views over the clouds, a steady descent, and hopefully an early arrival at your destination. But when your flight gets delayed on the tarmac instead of lifting off, or it ends up in a holding pattern rather than landing on time, things start to change. Your experience goes from smooth to anxiety-inducing as you worry about making your connection or getting home in time for dinner.

Large airports are among the busiest, most complex environments in aviation, with aircraft, ground crews, and service vehicles sharing crowded taxiways. Researchers at NASA’s Ames Research Center in California’s Silicon Valley recently worked with Boeing to advance three types of field tests – digital taxi information, safe taxiway, and safe runways – that could lead to safer, more efficient runway environments at airports.

During the digital taxi tests, pilots were given taxiway guidance directly on cockpit displays or tablets, instead of verbally from air traffic controllers. Aircraft autonomously followed digital routes while researchers monitored a suite of sensors designed to identify vehicles or other aircraft impeding the taxi path and runway. The system reduced pilot and air traffic controller workloads and the risk of verbal errors.  

Safe runway technology testing can also improve situational awareness for approaching aircraft. While preparing to land a Boeing aircraft during testing, the same sensors successfully flagged a vehicle on the runway, providing additional awareness to ensure pilots could avoid potential collisions or other safety concerns.

Together, these NASA capabilities aim to reduce miscommunication, ease pilot workloads, and keep airport traffic moving smoothly. Future testing will integrate the sensor and digital taxi systems into a simulated air traffic control environment to evaluate how the technologies can benefit overall management of the airspace.

For years, NASA has worked to improve your experience when flying by developing new technologies to modernize the commercial airline system. Key NASA technologies streamline and digitize the flying experience – from the departure gate, to the skies, to your safe arrival at your destination.

“Aviation safety is key to NASA’s research,” said Parimal Kopardekar, director of NASA’s Airspace Operations and Safety project. “Technology that can provide additional autonomy and support a future airspace with multiple aircraft operating in harmony is key to advancing the National Airspace System.”

NASA’s research innovations continue after your flight takes off. Modern flights constantly respond to shifting weather, turbulence, and traffic. Even small changes in direction or altitude can affect when a plane arrives. These changes can force flights into holding patterns while air traffic controllers attempt to rebalance the busy airspace.

NASA’s air traffic management researchers have been working for years to reduce those situations. In a 2025 collaborative effort with Boeing, United Airlines, and international partners, NASA evaluated real‑time trajectory sharing on domestic and transoceanic flights.

During that testing, a United Airlines Boeing 737 aircraft shared frequent flight information with airline operations centers and air traffic control. NASA used the data to understand how frequently those updates should be sent and what details matter most for generating accurate arrival predictions. Better information helps controllers sequence traffic more precisely, which means fewer holding patterns and more direct descents for passengers.

Pre-departure rerouting technology and digital exchange tools developed at NASA allow dispatchers and controllers to see the same digital picture of flights preparing to depart.

When a better route becomes available, controllers could coordinate the change digitally instead of relying on verbal communication between pilots, controllers, and dispatchers. The technology could lead to fewer delays, reduced fuel consumption, and more predictable operations for passengers.

NASA has now transferred the routing technology to the Federal Aviation Administration (FAA) and airlines will continue to test it. These tools build on decades of NASA contributions to national airspace modernization.

In coordination with the FAA, NASA has advanced automation concepts, improved how arrival and departure flows are managed, and introduced data‑driven software that commercial airlines use every day.

By working closely with airlines, manufacturers, and global partners, NASA is helping to improve every phase of flight to make air travel safer and more reliable, now and in the future.

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Catherine O’Connell-Cooper, APXS Strategic Planner and Payload Uplink/Downlink Lead, University New Brunswick, NB, Canada

Earth planning date: Friday, Sept. 11, 2026

This week we had two planning days (Tuesday and Friday), as Monday was Labor Day in North America, where many of the Curiosity team are based. Labor Day (the first Monday in September) marks the end of summer holidays and thrills, and the return to more typical routines and back to school.

The MSL team has marked several important milestones within the past few weeks — marking our 14th “Landiversary” on Aug. 6 and surpassing the 1-kilometer elevation mark and our 5000th sol (Martian day) in early September. Our next big date is not until Nov. 26, the 15th anniversary of launch, and so it feels like Curiosity is also back to a more routine schedule at this point.

We are moving up the valley known informally as “Valle Grande.” In recent weeks, we climbed up over what we interpreted as an “erosional supersurface” (which marks a gap in the usual rock record) and are now traversing through a subtly banded area. Bands are 25-200 meters (about 80-650 feet) in diameter, with morphological changes, such as bands with more sand and less rocky outcrops (which often appear darker from a distance because there is more sand) and others where outcrops seem more continuous that allow us to mark out rough contacts between them.  

The terrain this week was characterized by sparse outcrops with a rough texture, often nodular, surrounded by lots of sand and coarse pebbly sand. On Tuesday APXS and MAHLI investigated brushed nodular bedrock at “Cerro Armazones” and “Monte Melimoyu.” ChemCam acquired LIBS on a knot of dark-toned nodules at “Tuta Huallpas” and the dark-toned float rock “Acllahuasi.”

On Friday, after a drive of about 60 meters (nearly 200 feet), we found ourselves with mostly sand close to the rover and just one small rough-textured outcrop close enough for contact science and LIBS. Fortunately, the block was extremely interesting, with abundant small flakes and chips incorporated and laminated areas that are a bit smoother. We will investigate the rougher textures with MAHLI (“Yungay” and “Chiu Chiu”), APXS (Chiu Chiu) and ChemCam LIBS (“Puya Raimondii”) and a smoother area with LIBS (“Liolaemus Tacnae”).

Across both plans, the ChemCam long-distance imager and camera teams were hard at work. In addition to near-field images, which focus on areas close to the rover, both Mastcam and ChemCam acquired several larger mosaics on the buttes on either side of us (“Mishe Mokwa” and “Cordillera”) and looking back to the small butte “La Linea.” Mastcam also took some mosaics documenting the “Chocolatal” scuff, which we analyzed last week, and a larger mosaic of the “Sullivan Field” sand field where Chocolatal is located. Sullivan Field contains sand ripples, mega ripples, and transverse aeolian ridges, and was named by the team in honor of the late Robert Sullivan, a world expert on Martian sands and cherished member of the Curiosity science team.

In parallel to all the geology activities, the environmental team planned their usual full schedule of monitoring activities, such as dust-devil movies, suprahorizon movies looking at the crater rim, and tau images, which look at dust in the atmosphere.

Navcam and Mastcam acquired images of the path ahead in our drive direction. The subtle bands can just about be picked out here, by looking at tonal differences. It will be very interesting to see how these look and vary from each other when we get close enough to each one.

• Want to read more posts from the Curiosity team?

  
  
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August 19, 2025

August 30, 2026

August 19, 2025August 30, 2026

August 19, 2025

August 30, 2026

CurtainToggle2-Up

Arid shrublands in Western Australia were bursting with life in late austral winter 2026, when a profusion of wildflowers brought vivid colors to the rusty ochre landscape. After several wetter-than-normal months earlier in the year, dormant seeds in the soil awoke to produce carpets of blooms. Local experts think the display could be the best the area has seen in nearly two decades.

The images above, captured with the OLI (Operational Land Imager) on the NASA-USGS Landsat 8 satellite, compare the more verdant landscape of late August 2026 (right) with a similar time in 2025 (left), when it was drier. This area is located about 600 kilometers (370 miles) north of Perth in the Murchison region, one of Western Australia’s main areas for grazing sheep and cattle. The local vegetation includes grasses, saltbush, and the slow-growing evergreen mulga tree.

Every so often, a variety of wildflowers makes an appearance, too. In 2026, rainfall totals were above average in June and very much above average in August due to several cold fronts moving through the area, according to Australia’s Bureau of Meteorology. The rains helped rouse a diverse mix of flowers to bloom across the outback, including on a radio astronomy site managed by the Commonwealth Scientific and Industrial Research Organisation (CSIRO), Australia’s national science agency. The flower show included some threatened species, which the observatory has helped monitor on its formerly pastoral land.

Though the spectacle underfoot might have momentarily stolen the show, Inyarrimanha Ilgari Bundara, the CSIRO Murchison Radio-astronomy Observatory, is primarily focused on what’s overhead and the exploration of deep space. At the Murchison site, CSIRO operates several antenna arrays that observe and catalog objects in the southern sky. The remote facility is situated within a “radio quiet” zone, where terrestrial communications and electronic devices are controlled to limit electromagnetic interference with the instruments.

Other telescopes in CSIRO’s purview in Australia have played crucial roles in NASA missions from the agency’s early years to today. The Murriyang radio telescope in Parkes, New South Wales, tracked Mariner 2—the first successful planetary science mission—in 1962 and was an important receiving station for the Apollo 11 mission to the Moon in 1969. CSIRO also manages and operates the Canberra Deep Space Communication Complex, one of three facilities in NASA’s global Deep Space Network that supports interplanetary spacecraft missions and collects radar and radio astronomy observations. Both supported the Artemis II mission in April 2026.

NASA Earth Observatory images by Lauren Dauphin, using Landsat data from the U.S. Geological Survey. Photos © CSIRO Australia, September 16, 2026. Story by Lindsey Doermann.

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References & Resources

• Australian Bureau of Meteorology (2026) Australian climate history – Climate summaries. Accessed September 22, 2026.
• Australian Department of the Environment, Water, Heritage and the Arts (2008, August) Murchison bioregion (WA). Accessed September 22, 2026.
• CSIRO (2026, September 16) World-leading radio telescopes give space for stunning wildflowers. Accessed September 22, 2026.
• CSIRO (2024, June 24) NASA and CSIRO: partners in space. Accessed September 22, 2026.
• CSIRO, Inyarrimanha Ilgari Bundara, our Murchison Radio-astronomy Observatory. Accessed September 22, 2026.
• The Guardian (2026, September 13) Blankets of colour: Western Australia’s wildflower season bursts into life – in pictures. Accessed September 22, 2026.

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A New Lunar Crater: McGetchin

Explanation: A once-in-a-lifetime crater has appeared on the Moon! A comet or asteroid roughly the size of a humpback whale (approximately 10-20 meters, 30-60 feet) crashed into the Moon sometime between April and May of 2024. The Lunar Reconnaissance Orbiter (LRO), with its monthly monitoring of the Moon, captured today’s images of the lunar surface before and after the event. The resulting crater, named after Apollo-era lunar scientist McGetchin, is two soccer fields across. Craters of this size are only expected once every 132 years! Follow up thermal imaging revealed a large cold spot that surrounds the warm crater. Surface impacts will puff up the loose lunar sediment, or regolith, making it less dense and harder to retain heat. This event affected an area much larger than the visible crater, which will inform humanity’s understanding of surface impacts and the evolution of the Moon’s surface. It also reminds us all to be thankful for Earth’s atmosphere.

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Tomorrow’s picture: the great unknown

Date:	September 23, 2026
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Authors & editors:	Keighley Rockcliffe, Robert Nemiroff, Jerry Bonnell, Cecilia Chirenti
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NASA’s Hubble Space Telescope completed its 200,000th orbit around Earth on Sept. 19, marking another new milestone for an observatory that continues to transform our understanding of the universe.

Hubble has traveled more than 5 billion miles around Earth over its 36-year lifetime, exceeding 1.7 million total observations. An observation completed on the day of the 200,000th orbit pertains to one of Hubble’s defining scientific legacies: measuring the expansion rate of the universe, or the Hubble Constant. The image takes advantage of the telescope’s ability to return to the same regions of the sky over time to monitor for the reappearance of a supernova, or explosion of a star, called Athena.

Massive galaxy cluster MACS J0417, located at the left center of the image, acts as a gravitational lens, bending and magnifying light from objects far behind it. Light from a supernova can reach Earth along multiple paths, causing the same stellar explosion to appear more than once at times separated by months or even years depending on the path it took. Supernova Athena, discovered by NASA’s James Webb Space Telescope in 2025, is predicted to reappear between now and early March 2027. Measuring the timing of Athena’s reappearances can help researchers map the mass of MACS J0417, which acts as a magnifying, foreground lens for distant objects, and refine our understanding of the expansion rate of the universe.

After more than 36 years in space, Hubble still is reaching new heights of scientific productivity and impact. Hubble’s unique ability to observe and analyze light in ultraviolet and visible wavelengths complements NASA’s James Webb and Roman Space Telescopes’ capabilities. As a result, demand for Hubble observing time remains high as astronomers request about seven times as much observing time as is available each year.

Hubble continues to observe targets across every area of astronomy around the clock, with real-time tracking of those observations available on NASA’s website.

Media Contact:

Claire Andreoli
NASA’s Goddard Space Flight Center, Greenbelt, MD
[email protected]

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For more information, contact Jonathan E. Jones, Langley Research Center, [email protected]

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The purpose of this Technical Bulletin is to communicate the risks associated with freeze–thaw cycles in hydrazine monopropellant systems and to provide general recommendations for mitigating damage, operational hazards, and loss of system reliability in propulsion and auxiliary hydrazine systems.

Background
Hydrazine (N2H4) freezes near 1.6°C, and its phase transition is known to introduce risks to flight hardware. Multiple NASA programs have historically encountered hydrazine freeze related issues:

• Space Shuttle APU hydrazine lines were vulnerable to freeze induced contraction followed by thaw induced over expansion, capable of bursting plumbing. Shuttle flight rules permitted no more than two freeze–thaw cycles before considering the system degraded or failed.¹

• Voyager propulsion systems faced mission threatening scenarios as hydrazine temperatures approached the freezing/slush formation range (0.1–1.6°C). Detailed thermal modeling was required to prevent freezing of lines, blockage, and thruster malfunction.²

• Hydrazine thermodynamic properties confirm significant changes in density and pressure across phase transitions, emphasizing the sensitivity of propellant lines to freeze–thaw stress.³

These combined lessons form the basis for risk identification and mitigation.

Problem Summary
Freeze–thaw exposure of hydrazine systems presents the following critical risks:

• Structural Damage Hydrazine contraction during freezing allows additional propellant into confined lines, producing “superpacked” conditions that cause line or fitting rupture upon thaw.²

• Valve, Seal, and Diaphragm Compromise Elastomeric components and precision valve seats may experience cracking, distortion, or loss of sealing capability due to differential thermal expansion. Voyager thermal assessments highlighted susceptibility of long stainless steel runs to asymmetric temperature profiles.²

• Line Blockage and Slush Formation Partially thawed hydrazine can remain “slushy,” restricting flow, altering mass flow rates, and causing thruster hard starts or misfires.²

• Hazardous Leaks Freeze induced damage may allow hydrazine to escape confinement, posing significant toxicity, reactivity, and ground crew exposure hazards.

• Loss of System Reliability As documented in Shuttle operations, hydrazine systems exposed to freeze–thaw cycles become life limited, reducing redundancy and mission availability.¹

• Thermal Margin Uncertainty Voyager experience demonstrated that simple temperature readings cannot reliably determine true line temperature, necessitating high fidelity thermal modeling.²

Recommendations Prevention Measures
• Maintain Hydrazine Above Freezing Margin Keep all hydrazine systems above freezing, using heaters, insulation, blankets, or warm gas purge. Include uncertainty analysis in modeling and testing to ensure appropriate margins against freezing are maintained during all phases of operation.

• Avoid Uncontrolled Cooling During Ground Operations Ensure that tank, line, and valve components remain in environmentally controlled areas until integrated into the vehicle.

Post Freeze Response Protocol
If freezing cannot be ruled out:

• Suspend System Use Do not operate the hydrazine system until engineering evaluation is completed.

• Assess Number of Freeze–Thaw Cycles Treat each cycle as life limiting, an engineering assessment (static and fatigue) should be conducted based on conservative estimates of the line pressures during/after freeze/thaw cycles to understand potential line/component damage. Appropriate margin should be applied based on analysis uncertainty and/or underlying assumptions.

• Conduct Integrity Verification Perform pressure decay tests, NDE (if design allows), and valve health assessments.

• Implement Slow, Uniform Thawing To prevent thaw induced over pressure, warm hardware gradually and evenly. Shuttle experience with “superpacking” reinforces the necessity of controlled thawing.

Thruster and Valve Operational Readiness
• Ensure catalyst beds and valves reach proper thermal operating conditions before commanding any flow.

• Conduct pre start thermal stabilization periods, especially when flight readiness temperatures are marginal.

Thermal Modeling and Monitoring
• Utilize high fidelity thermal line modeling, emulating Voyager’s detailed propellant line modeling approach.²

• Avoid relying solely on bulk plate or tank temperatures to infer line readiness.

• Use thermal analysis and test to guide instrumentation placement on of the flight systems to monitor key temperatures set points.

Documentation and Incident Tracking
• Record all freeze exposures as reportable anomalies.

•Assign engineering disposition and track hardware life reduction accordingly.

Conclusion
Hydrazine freeze–thaw cycles present significant structural, operational, and safety risks for propulsion and auxiliary systems. Historical NASA programs show that prevention of hydrazine freezing is the most effective mitigation, with freeze exposure requiring formal engineering assessment, life limit adjustments, and controlled recovery procedures. Adhering to these recommendations will reduce risk to personnel, flight hardware, and mission success.

References
1. Space Shuttle Operational Flight Rules, Vol. A. All Flights, Mission Operations Diretorate, 20 June 2002. 2. W. C. Ledeboer, “Creating a Voyager Thermal Model 39 Years Into the Flight Mission, Along With Model Correlation and Application,” 8 July 2018. 3. J. L. Haws and B. G. Harden, “Thermodynamic Properties of Hydrazine,” Nov 1965.

Source: www.nasa.gov