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University Team Proposed Retractable, Pressurized Tunnels for Missions to Mars
NASA and China’s national space agency plan to send crewed missions to Mars in the coming decades. Per NASA’s Moon to Mars mission architecture, this will involve using infrastructure established through the Artemis Program to send crews to the Red Planet sometime in the 2030s or 2040s. Similar to Artemis, these missions will culminate in the creation of habitats that will facilitate long-duration exploration and research. Naturally, this presents many challenges, including lengthy deep-space transits and the hazards of extended periods in microgravity.
However, crewed missions will also face significant challenges upon arrival, such as the dangers of working in Mars’ thin, unbreathable atmosphere, extreme temperature variations, and elevated radiation levels. Fortunately, these challenges are inspiring innovative concepts from space agencies, their affiliated research institutes, and commercial partners. In a recent report, the Bioastronautics and Life Support Systems (BLiSS) team at the University of Michigan proposed an active, pressurized tunnel system to connect habitats on the Martian surface.
Their concept is described in the paper “LATCH: Lightweight Actuated Tunnels for Crewed Habitation,” which was submitted to the annual Moon to Mars eXploration Systems and Habitation (M2M X-Hab 2026) Academic Innovation Challenge. The report is one of several projects NASA selected under the X-Hab program, an incentive challenge administered by the National Space Grant Foundation (NSGF) that invites university students nationwide to provide concepts prototypes, and lessons learned that will help shape future space missions.
*Full Tunnel Extended with Components Labeled. Credit: BLiSS team/NTRS*
Dr. Nilton Renn, the John R. Barker Collegiate Professor in Planetary Sciences and Space Engineering at the University of Michigan, is the BLiSS team’s Principal Investigator. Dr. Tracie Prater, an esteemed aerospace and mechanical engineer at NASA’s Marshall Space Flight Center and a materials and processes engineer at United Launch Alliance, served as the Project Sponsor.
Challenges
Regardless of the location – the Moon or Mars – maintaining a continuous human presence requires a lot of movement. This means the movement of crews and cargo from the surface to orbit, and between surface assets – i.e., habitats, vehicles, landing pads, etc. Given the nature of the lunar and Martian environments, this will require crews to don spacesuits and conduct Extravehicular Activities (EVAs) every time. This is a time-consuming process that requires hours of preparation (pre-breathing oxygen), suiting up, airlock depressurization, and post-EVA cleanup.
This process takes a full day to complete, and also places crewmembers at risk of decompression and exposure to elevated radiation. Similarly, crews must remain in their spacesuits when entering or leaving the Mars Ascent Vehicle (MAV), which is cumbersome given the size of the suits themselves. The need for pressure suits during ascent and descent also adds mass to the vehicle’s overall load, increasing costs and the propellant required. As the team describes in their report:
In fact, preliminary analysis of the Mars Ascent Vehicle (MAV) used by crew to get to and from the Martian surface shows that each EVA suit requires 560 kilograms more propellant than an Intra-Vehicular Activity (IVA) suit would require. Additionally, EVA suits take up volume in the launch vehicle, roughly the size of a person. This would require a larger cabin size, which in turn would require more propellant mass.
To eliminate this burden, the HATCH team proposed a “lightweight pressurized tunnel system [which can] provide active positioning and berthing between crewed surface assets on Mars.” This concept would consist of tunnels that could be deployed as needed for transits, then retracted when not in use. Such tunnels would reduce transit times to and from habitats and landing pads from a full day to just a few minutes.
“The project calls for the development of concepts for a ‘lightweight pressurized tunnel system’ which can ‘provide active positioning and berthing between crewed surface assets on Mars,'” the team writes.
*Full Tunnel Model with Different Views. Credit: BLiSS team/NTRS*
Design
Each tunnel consists of an inflatable shell, structural rings, a passive extension mechanism (driven by motors and actuators), extendable handrails and tracks, and tread units mounted to each section. These tunnels are then integrated with each airlock on the habitat, which the crew can extend using the User Interface (UI). The UI will also allow crew members and ground controllers to view the tunnel’s status, which will be routinely monitored by sensors for leakage, contamination, or system faults.
The process begins with the crew member selecting a destination (the MAV or another surface element), then instructing the UI to extend the tunnel towards its hatch. The passive extension mechanism also allows crew members to make fine adjustments to its path, while sensor data and ground-controller monitoring provide feedback for alignment and trajectory correction. Once the tunnel is fully extended and both ends are secured, the tunnel will slowly pressurize with oxygen and nitrogen gas.
Once pressurized and the environment is confirmed safe by the sensors and ground control, the tunnel is used to allow up to two crew members to walk through it carrying cargo. During their transit, crew members not using the tunnel will be informed by the UI of any sudden safety issues. In the event of an emergency, alert systems will be activated automatically (lights, handrails, and other needed support systems) to help ensure the crew members safely reach the other side of the tunnel.
When not in use, the tunnels will be depressurized and retracted. This will prevent the tunnels from accumulating radiation inside and Martian dust on the outside. Maintaining them in the retracted position between usage also ensures that they are less vulnerable to debris damage.
Testing and Risk Assessment
As part of their proposal, the BLiSS team provided full Computer-Assisted Design (CAD) models and a prototype demonstrator of the tunnel and actuation system (along with the control software) for testing. In addition, a comprehensive risk matrix was developed to identify and assess potential hazards that could impact the success of future missions. This allowed the BLiSS team to identify various technical, schedule, cost, and safety-related risks that could compromise the functionality and safety of their system.
One notable risk involved the possibility of the structure yielding while astronauts are inside, leading to potential injury or death. To mitigate this, they proposed adding additional floor beams and/or a roll-out floor to support increased loads or accidents (e.g., cargo being dropped). The team also took measures to mitigate the risk of inaccurate berthing that could render the system unusable, including a multi-sensor fusion approach using LiDAR and computer vision. This would allow for cross-validation between sensors, enabling course correction and fine-motion detection.
*Prototype of a two-tendon actuator showing the system components and independent articulation of each segment. Credit: Baldwin Wallace University team/NTRS*
“By implementing robust mitigation measures and continuously monitoring and reassessing risks throughout the project life cycle, we aim to minimize disruptions and maximize the effectiveness of our tunnel system in supporting crew transportation between surface assets during space missions,” they state.
A similar concept submitted by the Baldwin Wallace University Engineering Department was the Tunnel Ready Elements for Active Deployment (T.R.E.A.D). Their concept is also in keeping with the goals of the 2026 M2M X-Hab Challenge: to create a system of extending tunnels that will connect surface elements on Mars, emphasizing reusability and preventing the accumulation of buildings and tunnels on the surface that no longer serve mission objectives.
For their proposal, the Baldwin Wallace team conceived a double-tendon-based actuation system with pressurized bladders. Each set of tendons consists of four individual cables controlled via a winch system, with the first set controlling the initial half of the tunnel’s curvature and the second controlling the final stretch. The tendon system also serves as a primary means of retraction and provides the necessary flexibility to bend and adjust to uneven terrain.
These and other concepts are merely some of the latest proposals for how astronauts will live and work in the extraterrestrial environment of Mars. As the 2030s approach, NASA and other space agencies will continue to ramp up their preparations for sending crewed missions to the Red Planet. The methods used and the lessons learned from these missions will likely inform the blueprint for off-world living should humanity embark on a path that leads us to become “interplanetary” someday.
Further Reading: NASA Technical Reports Server (NTRS)
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Peacemaker, aspiring nurse among victims in Compton shootings
A community activist who previously served as a government aide for a California lawmaker and a university student studying to become a nurse were among the three people killed in two separate shootings in Compton on Saturday.
The shootings, which also injured four people, occurred at two Fourth of July block parties about two miles apart, according to the Los Angeles County Sheriff’s Department. Investigators said there was no evidence that the shootings were related.
The first was reported at 11:20 p.m. in the 700 block of West Laurel Street, where five people were shot. A man and young woman were pronounced dead at the scene. A woman, child and man were wounded and taken to hospitals, according to the Sheriff’s Department.
The woman and child suffered non-life-threatening injuries, and the man was listed in critical condition, authorities said.
The Los Angeles County medical examiner’s office identified the young woman as 19-year-old Meah Bordenave-Jenkins. Authorities have not identified the second victim who died.
But in a statement Monday, Assemblymember Mike A. Gipson (D-Carson) named the man as Eric Washington, a former staffer.
“I do understand that Eric was attempting to deescalate a conflict during the holiday block party with children and families,” Gipson wrote. “It is no surprise that during the moment of this terrible act, Eric was trying to save a community by preventing a situation that would have taken lives. This bravery cost him his own life.”
Gipson said Washington had worked for him serving his district, which includes Compton. He described Washington as a talented communicator, a community organizer and a caring man who gave his heart and soul for his community.
“I am grieving — devastated by the loss and murder of this great young person. He tried everything possible to save Black and Brown boys in our community, especially against gun violence, and I am dismayed that what he fought against took his life,” Gipson wrote.
He said Washington also served as field deputy for forme Los Angeles City Councilmember Joe Buscaino.
In an Instagram post, Buscaino said he was heartbroken to hear about Washington’s death.
“Eric was so much more than a colleague. He was a son, brother, cousin, uncle, nephew, friend, mentor, and peacemaker,” he wrote. “He was a trailblazer and a public servant in the truest sense of the word.”
Gipson said Washington was a member of Alpha Phi Alpha, one of the oldest African American fraternities in the U.S., according to its website. He said Washington attended Compton College, the University of North Texas and Grambling State University.
At a morning news conference Monday outside Compton City Hall, the mother of Bordenave-Jenkins said her daughter was a sophomore at the University of Nevada, Las Vegas, who was studying to become a nurse and was visiting family when the shooting occurred, according to NBC4.
“She was full of life. Very compassionate. Very giving. She would do anything for anybody that asked. It’s devastating she’s no longer amongst us,” Ebone Jenkins said, according to the news station.
Bordenave-Jenkins reportedly had plans to take family members to church on Sunday before visiting Knott’s Berry Farm with a cousin this week.
About 40 minutes after the shooting that killed Bordenave-Jenkins and Washington, a second shooting took place in the 2100 block of North Grandee Avenue. Two Black men were shot. One was pronounced dead at the scene, and the other was taken to a hospital, according to the Sheriff’s Department.
The medical examiner identified the victim who died as 38-year-old Thaddeus Clark of Rialto.
The shootings marked a bloody weekend for Los Angeles County, which saw another shooting Sunday night in East Los Angeles that left four people wounded.
Najee Ali, director of Project Islamic Hope, said that the shootings in Compton were tragedies that could have been prevented and that there were questions about whether the city and the Sheriff’s Department could have done more to keep people safe.
Ali scheduled a “peace gathering to end gun violence” at 6 p.m. Monday outside the Compton Courthouse.
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Nearby “Super Earth” Could Host Life After All
In 2024, astronomers detected a rocky exoplanet, GJ 3378b, orbiting a red dwarf sun just 25 light-years from Earth in the direction of the northern constellation Camelopardalis. Based on radial velocity measurements, the discovery team estimated that this planet is 2.3 times as massive as Earth – making it a “Super Earth.” Thanks to revised analysis by a team led by researchers from the University of California, Irvine (UC Irvine), this planet appears to reside within its star’s habitable zone (HZ).
The research was led by Paul Robertson, an Associate Professor of Physics and Astronomy at UC Irvine. He was joined by researchers from Center for Planetary Systems Habitability at the University of Texas, the Astrophysics & Space Institute, the Anton Pannekoek Institute for Astronomy, the Center for Exoplanets and Habitable Worlds, the Astrobiology Research Center, the NSF National Optical-Infrared Astronomy Research Laboratory, NASA’s Jet Propulsion Laboratory (JPL) and Goddard Space Flight Center, and multiple universities and research institutes.
Red dwarfs are the most common class of star in the Universe, accounting for 70% to 75% of stars in the Milky Way and up to 90% in elliptical galaxies. What’s more, the study of red dwarf stars close to the Solar System suggests that they are very good at forming rocky planets that orbit within their HZs. This makes them an important target in the search for life outside our solar system. However, red dwarf stars are known for being variable and prone to flare activity, which could render planets within the HZs completely uninhabitable.
The Habitable Zone Planet Finder instrument during installation in its clean-room enclosure in the Hobby-Eberly Telescope at McDonald Observatory. Credit: Guðmundur Stefánssonn/Penn State.
In addition, the dim nature of red dwarfs makes it very difficult to detect Earth-like planets, which are very small compared to other exoplanet types (“Super-Earths,” “mini-Neptunes,” and gas giants). As a result, scientists must rely on specialized instrumentation, which includes the Habitable-zone Planet Finder (HPF) instrument on the Hobby-Eberly Telescope. This instrument conducts radial velocity measurements, which detect subtle wobbles in a star’s orbit caused by one or more planets.
As Paul Robertson explained in a McDonald Observatory press release:
Our mantra is ‘follow the water.’ It’s the one thing every known living thing on Earth needs, so that’s the first thing we look for when trying to find environments that could sustain life. The Habitable-zone Planet Finder is optimized to use infrared light. As stars get smaller, they get cooler, and most of their energy comes out in infrared wavelengths. So, we put an infrared spectrometer on a 10-meter telescope, and that gives us more raw light-collecting power to observe these faint stars.
Since 2018, the Habitable-zone Planet Finder has helped astronomers detect exoplanets and catalog those that might be “potentially habitable.”
“The name of the game is precision. In order to find those low-mass planets, you’re always looking for tiny signals,” added Michael Endl, an astronomer and planetary scientist at the Center for Planetary Systems Habitability at the University of Texas, Austin, and the McDonald Observatory. “If your instruments aren’t precise enough, you won’t find them. You can’t find them.”
When GJ 3378b was first discovered in 2024, it was thought to be about five times as massive as Earth. A Super-Earth this massive would be able to hold onto an atmosphere, but it would be so dense as to crush any life on its surface. The new analysis, however, shows that it is closer to 2.3 times Earth’s mass, which increases the likelihood that the planet lacks a smothering atmosphere. The team also refined the planet’s orbital period from 25 days to 21, which places it within the star’s HZ.
*This artist’s impression shows the planet Proxima b orbiting the red dwarf star Proxima Centauri, the closest star to the Solar System. Credit: ESO/M. Kornmesser*
On the other hand, its closer orbit may also mean that it is subject to more intense radiation, which could evaporate any atmosphere present. More observations are necessary, which will be possible as next-generation telescopes become operational in the coming years. This includes the Giant Magellan Telescope (GMT), the Extremely Large Telescope (ELT), and the Habitable Worlds Observatory (HWO), which will have access to the HPF catalog.
The powerful mirrors these observatories will host, along with adaptive optics (AO), advanced coronographs, and spectrometers, will enable direct observations of these planets for indications of life (aka. biosignatures). Said Endl:
The ultimate goal is biosignatures. We really want to know, ‘Are we alone in the universe?’ We are still in the reconnaissance phase of our solar neighborhood, trying to find the planets around the nearest stars because those will be the easiest ones to detect a biosignature on. This planet brings us one step closer to knowing all of our neighbors and, ultimately, which might be hospitable for life.
Further Reading: The University of Texas at Austin
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