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By European Space Agency
The European Space Agency’s Plato spacecraft has safely arrived at ESTEC, ESA’s technical heart in the Netherlands. There, engineers will complete the spacecraft by connecting its solar panels and sunshield, and carry out a series of critical tests to confirm that Plato is fit for launch and ready for its planet-hunting mission in space.
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By NASA
Flight Engineer Joe Acaba works in the U.S. Destiny laboratory module on the International Space Station, setting up hardware for the Zero Boil-Off Tank (ZBOT) experiment. Joe Acaba Space missions rely on cryogenic fluids — extremely cold liquids like liquid hydrogen and oxygen — for both propulsion and life support systems. These fuels must be kept at ultra-low cryogenic temperatures to remain in liquid form; however, solar heating and other sources of heat increase the rate of evaporation of the liquid and cause the pressure in the storage tank to increase. Current storage methods require venting the cryogenic propellant to space to control the pressure in fuel tanks.
NASA’s Zero Boil-Off Tank Noncondensables (ZBOT-NC) experiment is the continuation of Zero Boil-Off studies gathering crucial data to optimize fuel storage systems for space missions. The experiment will launch aboard Northrop Grumman’s 23rd resupply mission to the International Space Station.
When Cold Fuel Gets Too Warm
Even with multilayer insulation, heat unavoidably seeps into cryogenic fuel tanks from surrounding structures and the space environment, causing an increase in the liquid temperature and an associated increase in the evaporation rate. In turn, the pressure inside the tank increases. This process is called “boil-off” and the increase in tank pressure is referred to as “self-pressurization.”
Venting excess gas to the environment or space when this process occurs is highly undesirable and becomes mission-critical on extended journeys. If crew members used current fuel storage methods for a years-long Mars expedition, all propellant might be lost to boil-off before the trip ends.
NASA’s ZBOT experiments are investigating active pressure control methods to eliminate wasteful fuel venting. Specifically, active control through the use of jet mixing and other techniques are being evaluated and tested in the ZBOT series of experiments.
The Pressure Control Problem
ZBOT-NC further studies how noncondensable gases (NCGs) affect fuel tank behavior when present in spacecraft systems. NCGs don’t turn into liquid under the tank’s operating conditions and can affect tank pressure.
The investigation, which is led out of Glenn Research Center, will operate inside the Microgravity Science Glovebox aboard the space station to gather data on how NCGs affect volatile liquid behavior in microgravity. It’s part of an effort to advance cryogenic fluid management technologies and help NASA better understand low-gravity fluid behavior.
Researchers will measure pressure and temperature as they study how these gases change evaporation and condensation rates. Previous studies indicate the gases create barriers that could reduce a tank’s ability to maintain proper pressure control — a potentially serious issue for extended space missions.
How this benefits space exploration
The research directly supports Mars missions and other long-duration space travel by helping engineers design more efficient fuel storage systems and future space depots. The findings may also benefit scientific instruments on space telescopes and probes that rely on cryogenic fluids to maintain the extremely low temperatures needed for operation.
How this benefits humanity
The investigation could improve tank design models for medical, industrial, and energy production applications that depend on long-term cryogenic storage on Earth.
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Zero Boil-Off Tank Noncondensables (ZBOT-NC)
2 min read Principal Investigator(s): Overview: Zero Boil-Off Tank Noncondensables (ZBOT-NC) investigates how noncondensable gases interfere with fuel storage systems in microgravity. The…
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Biological & Physical Sciences Division
NASA’s Biological and Physical Sciences Division pioneers scientific discovery and enables exploration by using space environments to conduct investigations not possible on Earth. Studying biological and physical phenomenon under extreme conditions allows researchers to advance the fundamental scientific knowledge required to go farther and stay longer in space, while also benefitting life on Earth.
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By European Space Agency
The second of the Meteosat Third Generation Imagers, MTG-I2, has passed some important milestones in the cleanroom facilities at Thales Alenia Space in Cannes, southern France.
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By NASA
Credit: NASA’s Goddard Space Flight Center; Music Credit: “History in Motion” by Fred Dubois [SACEM], Koka Media [SACEM], Universal Publishing Production Music France [SACEM], and Universal Production Music. On Aug. 7 and 8, NASA’s Nancy Grace Roman Space Telescope team assessed the observatory’s solar panels and a visor-like sunshade called the deployable aperture cover — two components that will be stowed for launch and unfold in space. Engineers confirmed their successful operation during a closely monitored sequence in simulated space-like conditions. On the first day, Roman’s four outer solar panels were deployed one at a time, each unfolding over 30 seconds with 30-second pauses between them. The visor followed in a separate test the next day. These assessments help ensure Roman will perform as expected in space. Roman is slated to launch no later than May 2027, with the team working toward a potential early launch as soon as fall 2026.
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Last Updated Aug 26, 2025 EditorAshley BalzerContactAshley Balzerashley.m.balzer@nasa.gov Related Terms
Goddard Space Flight Center Nancy Grace Roman Space Telescope View the full article
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By NASA
3 min read
Preparations for Next Moonwalk Simulations Underway (and Underwater)
The Lunar Environment Structural Test Rig simulates the intense cold of the lunar night, ranging from 40 Kelvin (K) to 125 K while maintaining a vacuum environment. This creates a tool by which scientists and engineers can test materials, electronics, and flight hardware for future Moon and Mars missions, characterizing their behaviors at these temperatures while also validating their ability to meet design requirements.
Cryogenic engineer Adam Rice tests the Lunar Environment Structural Test Rig to simulate the thermal-vacuum conditions of the lunar night on Thursday, May 22, 2025.NASA/Jef Janis Facility Overview
The Lunar Environment Structural Test Rig (LESTR) approaches the problem of creating a simulated lunar environment by departing from typical fluid immersion or jacketed-and-chilled chamber systems. It does this by using a cryocooler to reject heat and bring the test section to any point desired by the test engineer, as low as 40 K or as high as 125 K in a vacuum environment. By combining high vacuum and cryogenic temperatures, LESTR enables safe, accurate, and cost-effective testing of materials and hardware destined for the Moon and beyond. Its modular setup supports a wide range of components — from spacesuits to rover wheels to electronics — while laying the foundation for future Moon and Mars mission technologies.
Quick Facts
LESTR is a cryogenic mechanical test system built up within a conventional load frame with the goal of providing a tool to simulate the thermal-vacuum conditions of the lunar night to engineers tasked with creating the materials, tools, and machinery to succeed in NASA’s missions.
LESTR replicates extreme lunar night environments — including temperatures as low as 40 K and high vacuum (<5×10⁻⁷ Torr) — enabling true-to-space testing without liquid cryogens. Unlike traditional “wet” methods, LESTR uses a cryocooler and vacuum system to create an environment accurate to the lunar surface. From rover wheels to spacesuits to electronics, LESTR supports static and dynamic testing across a wide range of Moon and Mars mission hardware. With scalable architecture and precision thermal control, LESTR lays critical groundwork for advancing the technologies of NASA’s Artemis missions and beyond. Capabilities
Specifications
Temperature Range: 40 K to 125 K Load Capacity: ~10 kN Vacuum Level: <5×10⁻⁷ Torr Test Volume (Cold Box Dimensions): 7.5 by 9.5 by 11.5 inches Maximum Cycle Rate: 100 Hz Time to Vacuum:10⁻⁵ Torr in less than one hour 10⁻⁶ Torr in four hours Features
Dry cryogenic testing (no fluid cryogen immersion) “Dial-a-temperature” control for precise thermal conditions Integrated optical extensometer for strain imaging Digital image correlation and electrical feedthroughs support a variety of data collection methods Native support for high-duration cyclic testing Applications
Cryogenic Lifecycle Testing: fatigue, fracture, and durability assessments Low-Frequency Vibration Testing: electronics qualification for mobility systems Static Load Testing: material behavior characterization in lunar-like environments Suspension and Drivetrain Testing: shock absorbers, wheels, springs, and textiles Textiles Testing: evaluation of spacesuits and habitat fabrics Dynamic Load Testing: up to 10 kN linear capacity, 60 mm stroke Contact
Cryogenic and Mechanical Evaluation Lab Manager: Andrew Ring
216-433-9623
Andrew.J.Ring@nasa.gov
LESTR Technical Lead: Ariel Dimston
216-433-2893
Ariel.E.Dimston@nasa.gov
Using Our Facilities
NASA’s Glenn Research Center in Cleveland provides ground test facilities to industry, government, and academia. If you are considering testing in one of our facilities or would like further information about a specific facility or capability, please let us know.
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The Lunar Environment Structural Test Rig simulates the intense cold of the lunar night on Friday, June 6, 2025.NASA/Steven Logan The Lunar Environment Structural Test Rig uses a cryocooler to reject heat and bring the test section as low as 40 Kelvin in a vacuum environment on Thursday, May 22, 2025.NASA/Jef Janis Keep Exploring Discover More Topics From NASA
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