Terraforming Mars has been the long-term dream of colonization enthusiasts for decades. But when you start to grapple with the actual physics of what would be necessary to do so, the effort seems further and further out of reach. Depictions like those of Kim Stanley Robinson's Mars Trilogy are just wildly unrealistic regarding the sheer amount of material that must be moved to the Red Planet to achieve anything remotely resembling Earth-like conditions. That is the conclusion of an abstract presented at the 56th Lunar and Planetary Science Conference by Leszek Czechowski of the Polish Academy of Sciences.

The paper, entitled "Energy problems of terraforming Mars," tackles the reality of what it would take in terms of gas to bring Mars up to an "acceptable" level of pressure. As Dr. Czechowski points out, water inside a person's body would begin boiling immediately at the current pressure on Mars, meaning that everyone on the entire planet would have to wear a pressure suit. However, certain places on the planet are closer to getting to the pressure level, estimated at about 1/10th Earth's atmospheric pressure, where water would only boil at 50C, which is slightly above typical body temperature. You gotta start somewhere, at least.

The place closest to that pressure currently on Mars is in Hellas Planitia, Mars' "lowland," where the average pressure is about 1/100th that of sea level on Earth, and only 1/10 the amount needed to ensure a person doesn't immediately boil to death if their skin is exposed to the atmosphere. While Dr. Czechowski mentions several other scenarios, such as bringing the average atmospheric pressure on the planet up to that of sea level on Earth, the total amount of atmosphere that would need to be shipped in is an order of magnitude more, which already is extremely expensive in terms of the energy required to realize that increase.

Fraser discusses various ways to terraform Mars.

Where would we get all this material for the atmosphere? Why the Kuiper Belt, of course. Or at least that is Dr. Czechowski's conclusion. He looked at the possibility of using asteroids from the main belt, which has the advantage of being relatively close to Mars. However, they lack enough water and nitrogen to help build an Earth-like atmosphere. The Oort Cloud, the giant, at this point theoretical, disk that contains billions of icy bodies, has more than enough material to supply Mars'’ atmosphere. However, after some brief calculations, Dr. Czechowski realized it would take 15,000 years to get a reasonably sized Oort Cloud object near enough to Mars to make a material impact on its atmosphere.

Impact is the optimal word as well, as the model these calculations describe slams the small body into Mars itself, thereby releasing both its material and a large enough of energy that helps warm the planet. Kuiper Belt objects seem the best fit for this, as they contain a lot of water and could theoretically be brought to Mars over decades rather than millennia. However, they are also very unpredictable when brought close to the Sun. They could fall apart, with some of the material going to waste in the inner solar system, especially if the technique used to send them into the inner solar system involves a gravity assist. Such a maneuver could tear apart these relatively loosely held-together balls of ice and rock.

Dr. Czechowski's final conclusion is simple - at least in theory, we can get enough material to dramatically increase Mars' atmospheric pressure to a point where it is tolerable for humans - or at least to a point where they don't die immediately when exposed to it. However, doing so will require us to crash a sizeable icy body from the Kuiper Belt into it. To do that, engineers would need to design a propulsion system that doesn't rely on gravity to direct the icy body. In the conclusion of his paper, Dr. Czechowski suggests a fusion reactor powering an ion engine but doesn't provide many details about what that system would look like.

There might be other methods to terraform Mars that involve bioengineering, but they would still take an absurd amount of energy, as Fraser discusses

Given the technological requirements needed to achieve that vision, it seems we're a long way off from doing so. But that won't stop Mars enthusiasts from dreaming of a terraformed future—even if it does involve smacking the planet with multiple large rocks to get there.

Learn More:

• L. Czechowski - Energy problems of terraforming Mars
• UT - New Study Shows Mars Could be Terraformed Using Resources that are Already There
• UT - An Absolutely Bonkers Plan to Give Mars an Artificial Magnetosphere
• UT - How Do We Terraform Mars?

SPHEREx stands for the Spectro-Photometer for the History of the Universe, Epoch of Reionization, and Ices Explorer. You can see why NASA came up with a natty name for it! It’s their new infrared space telescope designed to give us unprecedented insights into the evolution of the Universe. It was selected back in 2019 as part of NASA's Medium Explorer program and aims to; conduct an all-sky spectral survey to measure the history of galaxy formation, investigate the origins of water and molecules in regions where stars and planets form and explore the distribution of interstellar ice. Onboard it has cutting-edge spectroscopy technology so that it can observe in wavelengths ranging from 0.75 to 5.0 microns and allow us to peer through dust that obscures visible light.

SPHEREx on a work stand ahead of prelaunch operations at the Astrotech Processing Facility at Vandenberg Space Force Base in California in January 2025

(Credit : NASA Kennedy Space Center / BAE Systems/Benjamin Fry)

The new space observatory will scan the entire sky four times over a two-year mission, using spectroscopy to examine light from hundreds of millions of celestial objects across more wavelengths than any previous all-sky survey. It will capture infrared light invisible to the human eye and to process the images, assign a visible light colour to each infrared wavelength. This technique allows scientists to determine an object's composition or a galaxy's distance, enabling research on fundamental topics ranging from the earliest moments of the birth of the Universe to the origins of water in our Galaxy.

When light enters the telescope, it splits along two paths leading to rows of three detectors each. Each of its six detectors captures 17 unique wavelength bands, creating a detailed spectrum of 102 distinct hues in every exposure. Unlike standard filters that block all wavelengths except one specific colour, SPHEREx uses special "rainbow-tinted" filters where the wavelengths blocked change gradually from top to bottom, allowing it to capture a more complete spectrum of cosmic light!

SPHEREx and its detectors

( Credit : NASA/JPL-Caltech)

After its launch, engineers at the Jet Propulsion Laboratory have been completing spacecraft checks on SPHEREx. To date, all systems are functioning properly and the spacecraft is in good health. Its detectors and hardware have been cooling down to their operating temperature of around -210°C, a critical part of its design since heat would interfere with the telescope's ability to detect infrared light. The initial images just released confirm that the telescope's focus is correct which is a release to engineers since its focus was permanently set before launch and cannot be adjusted while in orbit!

“Our spacecraft has opened its eyes on the universe, it’s performing just as it was designed to” - Olivier Doré, SPHEREx project scientist at Caltech and NASA’s Jet Propulsion Laboratory

SPHEREx is expected to begin operations in late April and astronomers worldwide are waiting in keen anticipation. The mission represents a significant leap forward in our attempts to understand the evolution of the Universe. By mapping the entire sky with unprecedented detail, SPHEREx will create a three-dimensional map of our cosmos more comprehensive than any before and there is no doubt, the coming months will reveal the full capabilities of this innovative new observatory.

Source : 

• NASA’s SPHEREx Takes First Images, Preps to Study Millions of Galaxies

RELATED VIDEOS

Mars is well known for its seasonal dust storms, which occur when the southern hemisphere experiences summer. Periodically, these storms grow to engulf the entire planet and can last for months, wreaking havoc on robotic missions. Smaller regional storms are far more common on Mars, as are swirling columns of air and dust (aka. dust devils). NASA's Perseverance rover recently took pictures of several dust devils on the rim of the Jezero crater. Some of these images were stitched together to create a short video of a larger dust devil consuming a smaller one.

These images were taken by the rover's navigation camera on January 25th when the rover was exploring the location called "Witch Hazel Hill." The rover was about 1 km (0.6 mi) from the two dust devils, the larger of which was approximately 65 m (210 ft) wide, while the smaller, trailing dust devil was roughly 5 m (16 ft). The captures were part of an imaging experiment conducted by Perseverance's science team to learn more about the planet's atmospheric dynamics. Two other dust devils can also be seen in the background at the left and center of the video (shown below).

Like dust devils on Earth, these weather patterns are formed by rising and rotating air columns. They begin close to the ground, where the air is heated by contact with the warmer ground, then rises through the cooler air above. Meanwhile, cooler air moves in to occupy the space near the surface, which causes the rising air to rotate and pick up speed. This process also kicks up dust from the surface, creating the swirling columns of dust and air that meteorologists call "convective vortices" or dust devils.

Mark Lemmon, a Perseverance scientist at the Space Science Institute (SSI), explained in a NASA press release:

"Convective vortices — aka dust devils — can be rather fiendish. These mini-twisters wander the surface of Mars, picking up dust as they go and lowering the visibility in their immediate area. If two dust devils happen upon each other, they can either obliterate one another or merge, with the stronger one consuming the weaker. If you feel bad for the little devil in our latest video, it may give you some solace to know the larger perpetrator most likely met its own end a few minutes later. Dust devils on Mars only last about 10 minutes.”

Martian dust devils were first photographed from space by NASA's Viking orbiters, which studied Mars in the 1970s. The Pathfinder mission, consisting of a lander and the Sojourner rover, was the first to image a dust devil on the surface. Subsequent orbiters and rovers, like the Spirit and Opportunity rovers and the Mars Reconnaissance Orbiter (MRO), have taken images of these weather patterns from the surface and space. The Curiosity rover also took multiple images of dust devils in the Gale Crater, some of which were used to create a video.

Since landing in the Jezero Crater in 2021, Perseverance has also observed dust devils and even recorded what they sound like using its SuperCam microphone. Said Katie Stack Morgan, a project scientist for the Perseverance rover at NASA's Jet Propulsion Laboratory:

"Dust devils play a significant role in Martian weather patterns. Dust devil study is important because these phenomena indicate atmospheric conditions, such as prevailing wind directions and speed, and are responsible for about half the dust in the Martian atmosphere."

Learning more about these swirling columns of air is vital to understanding the dynamics of Mars' atmosphere. It could also lead to predictive models, allowing scientists to know where they might occur in advance. Capturing these features is presently a matter of luck and timing, which is why Perseverance routinely monitors in all directions for them.

Further Reading: 

• NASA

Sometimes, a brief update is all that is needed to keep the public interested in major projects. That's precisely what John Baker and James Keane of NASA's Jet Propulsion Laboratory provided to the 56th annual Lunar and Planetary Science Conference held in Texas last month. Their brief paper showcased the ongoing development of the Endurance autonomous rover, which was more thoroughly fleshed out in a massive 296-page mission concept study back in 2023. But what has the team been up to since then?

Before getting to the details of current work, it's best to understand the original purpose of the mission. Endurance is a response to the Planetary Science Decadal Survey, which listed developing an autonomous rover to explore the area around the lunar south pole as the highest priority for NASA's Lunar Exploration and Discovery Program. In its current iteration, Endurance will traverse over 2,000 km of the South Pole-Aitken basin, one of the most scientifically interesting parts of the Moon.

It's also the part most likely to attract human visitors as part of NASA's plan to return to the Moon. Endurance will be ready, having collected up to 100 kg of samples along the way for hand-off to the humans who will be joining it. AI will also play a central role in the rover, helping it navigate and even helping to decide what rocks to sample.

Fraser discusses why the lunar south pole - the target of Endurance - is so important.

So, what has the development team, led by Dr. Keane and Mr. Baker, been up to since the original project announcement? Quite a lot, apparently. One of the major milestones was developing a basic system design and then having an artist render what it would look like operating with an astronaut. While looks are nice, it's the underlying engineering that will really enable Endurance.

There were three major steps in those directions. First, the team has been working to utilize different data sources about the Moon to map out a planned path for the rover. 2,000 km is quite the distance, and the lunar south pole isn't particularly hospitable. Navigating around boulders and crevasses is the standard operating procedure for any planetary exploration rover, but Endurance will have to do it 10 times faster than any of its predecessors to complete its mission.

To do so, AI will be needed. Perseverance, the most capable rover launched to date, used a relatively limited AI platform to navigate around Jezero Crater on Mars. However, advances in the field have skyrocketed the technology's capabilities since then, and JPL scientists have taken advantage of it. They implemented a code update to a test rover called Athena that would allow it to navigate semi-autonomously at the speed required by Endurance. It even did so at night, which is particularly important on the Moon. 

Water is one thing that is expected to be found at the pole - as Fraser explains.

Athena itself wasn't the only demonstration platform for the technology, though—the researchers also built the Exploration Rover for Navigating Extreme and Sloped Terrains, or ERNEST, rover test bed, which looks much more similar to the system design of Endurance. It's about half the size of the full rover but will enable testing of the various subsystems of its larger-scale successor.

Even with all the technical advances, there is still some basic science to get right. The next major step for Endurance is implementing a Science Definition Team for the project. This team will fully define the science objectives of the mission, allowing the team to fully scope out the engineering challenges for the rover's further development.

Given budget cuts across the US federal government, the Artemis program's future is still uncertain. However, as long as there are still people employed at JPL, scientists and engineers will still be hoping to create Endurance or something like it. With luck and continued funding, one day, it will roam the surface of our nearest neighbor and travel where no rover has gone before.

Learn more:

• J Baker & JT Keane - STATUS UPDATE ON ENDURANCE: A LUNAR SOUTH POLE–AITKEN BASIN SAMPLE RETURN AND EXPLORATION ROVE
• JT Keane et al - Endurance Concept Study Report
• UT - A Rover Could Weave its Way Between Patches of Sunlight on the Lunar South Pole
• UT - NASA Stops Work on VIPER Moon Rover, Citing Cost and Schedule Issues

RELATED VIDEOS

In the coming years, NASA will send astronauts to the Moon for the first time since the end of the Apollo Era. These missions will lead to the creation of permanent infrastructure that will allow for regular trips to the lunar surface. An important aspect of this long-term plan is to develop components that can be reused as much as possible. This includes the Orion spacecraft that will transport the astronauts to lunar orbit (and back), the Lunar Gateway that will accommodate crews and a reusable lander to travel to and from the surface.

Unfortunately, the main launch vehicle for the Artemis Program, the Space Launch System (SLS), is an expendable system. While the Orion crew capsule is reusable, the European Service Modules (ESM) - an integral part of the Orion spacecraft that returns the crew to Earth - is not. In a recent paper, an international team of scientists identified how the ESM could be reused. Rather than letting them burn up in Earth's atmosphere, as planned, they recommend that the ESMs use their power and propulsion capability to conduct valuable scientific research.

The study was led by Carol Raymond, a researcher at NASA's Jet Propulsion Laboratory, the principal investigator of the Europa Clipper ICEMAG instrument team, and the deputy principal investigator of the Dawn mission. She was joined by multiple colleagues from JPL, the Washington University in St. Louis, the German Aerospace Center (DLR), the Max Planck Institute for Solar System Research, Airbus Defence and Space, the Leibniz-Institute of Evolution and Biodiversity Science (MfN), and the Southwest Research Institute (SwRI).

The ESM is a key element of the Orion spacecraft, providing power, propulsion, attitude control, thermal control, and payload support. The module is vital to NASA's Artemis Program, ensuring astronauts reach the Moon and return to Earth. After the separation of the Crew Module, the current plan is to allow the ESMs to burn up in Earth's atmosphere. As the authors indicate, this would be a waste since the ESM still has capabilities long after it has fulfilled its primary mission.

By leveraging these capabilities, the authors argue that the ESMs could provide low-cost opportunities for lucrative scientific research and multiple mission profiles. While the current designs for the ESM do not include scientific instruments, the mass capabilities allow for scientific payloads. Their work builds on a previous scientific workshop hosted by JPL in the summer of 2024, where US and European participants met to discuss the benefits of extended missions using repurposed ESMs after they complete their primary mission.

The concepts they considered were based on three categories: 1) no augmentation of the ESM, 2) minimal augmentation, and 3) low-to-moderate augmentation. Possible mission architectures were also considered, leading to a list of over thirty concepts.

Local Missions

The authors indicate that a minimally augmented ESM could accommodate up to 300 kg (660 lbs) of scientific instruments and be used to study near-Earth asteroids (NEAs) and the Moon. Regarding NEAs, these spacecraft could serve as observer missions, conduct flybys, and rendezvous with asteroids. This could potentially enable the study of unexplored classes of NEAs that could contain water and metals.

Another concept they suggest is using the ESM as a large kinetic impactor to the Moon and NEAs. Regarding the former, an ESM could be directed toward one of the Moon's Permanent Shadowed Regions (PSRs). Similar to the Chandrayaan -1 Moon Impact Probe (MIP) and the Lunar Crater Observation and Sensing Satellite (LCROSS), which revealed the presence of water ice on the Moon, this mission would excavate subsurface material and create a plume of material that could be observed by other spacecraft (possibly another ESM).

It could also be used to evaluate NEAs that could impact Earth someday, known as potentiallyhazardous objects (PHOs). It could also deflect PHOs, similar to the Double Asteroid Redirection Test (DART) mission. With a dry mass seven times larger than the DART mission, a repurposed ESM could deflect much larger bodies that periodically cross Earth's orbit.

Long-Range Missions

Other mission profiles include the exploration of Mars' moons, Phobos and Deimos. In this case, repurposed ESMs could conduct flybys or even land on these moons, providing the first sample analyses to learn more about their composition and place of origin. This has the potential to confirm theories that Phobos and Deimos are bodies that were kicked out of the Main Belt and were eventually captured by Mars' gravity.

Another possibility is to send a repurposed mission to Venus, consistent with recent recommendations from the Venus Exploration Analysis Group (VExAG). They propose sending a long-term communications asset to Venus to replicate the success of the Mars Relay Network. According to the authors, an ESM could be equipped with radio software and placed into a high-altitude orbit around Venus, supporting future orbiters and surface missions.

The authors stress that the main priority for each ESM mission is to accomplish its primary mission objectives for the Artemis program. However, the scientific benefits of repurposed ESMs are worthy of consideration, and the team hopes that their paper will stimulate discussion and inform future planning.

Further Reading: 

• URSA

The 2025 Lunar and Planetary Science Conference, which took place from March 10–14 in The Woodlands, Texas, witnessed some very interesting proposals for space exploration and science. In addition to bold mission concepts, scientists presented exciting opportunities for potential research that addresses major questions. Not the least of which was "How can humans survive in space and extraterrestrial environments"? One study in particular presented how the study of tardigrades could help address the challenges involved.

The study was conducted by Isadora Arantes, a NASA ambassador and astronaut candidate; and Geancarlo Zanatta, an Associate Professor at the Federal University of Rio Grande do Sul. As they indicate, tardigrades (aka. "water bears") have become the focus of considerable research in recent years. These extremophiles are renowned for their exceptional resilience to hostile environments. This includes temperatures ranging from -271°C to over 150°C, pressures exceeding 1,200 times atmospheric levels, desiccation, and intense ionizing radiation.

This has made them a pivotal model for astrobiological research and the potential for life beyond Earth. According to Arantes and Prof. Zanatta, specific proteins like Dsup (Damage Suppressor) are key to their resilience. This protein mitigates DNA damage caused by radiation exposure by forming a protective shield around genetic material, reducing double-strand breaks and preserving genomic integrity. For the sake of their study, they conducted simulations of the molecular dynamics of Dsup proteins using Gromacs software.

Their results show how the protein prevents genetic mutations by dissipating radiation and minimizing DNA disruptions. Beyond Dsup, they also investigated heat shock proteins (HSPs) and antioxidant enzymes, which maintain protein stability during thermal stress and mitigate oxidative damage caused by high pressure and radiation (respectively). As they wrote, these findings are indicative of what types of lifeforms may exist in extreme environments beyond Earth:

"[F]indings demonstrate that tardigrades' resilience mirrors potential life forms in extreme extraterrestrial environments, such as Mars, Europa, and Titan. Mars, with its radiation-rich environment and episodic liquid water, and the icy moons Europa and Titan, with subsurface oceans and cryogenic conditions, serve as benchmarks for understanding extremophile survival. For example, the stability of proteins in Titan’s subsurface ocean, as explored in related studies, suggests the plausibility of life in aqueous-ammonia mixtures under cryogenic conditions."

Beyond astrobiology, research into tardigrade adaptation has applications in biotechnology that could make humans more resilient. This includes improving radiation resistance, protecting against extreme cold in human cells, and engineering crops to survive in extreme climates. Arantes and Prof. Zanatta add that these applications "highlight the broader relevance of extremophiles in addressing challenges on Earth while contributing to the scientific foundation for future space missions."

They also note that further research involving integrated computational and experimental approaches is crucial to uncovering extremophile survival mechanisms. This has the potential to advance our understanding of life's resilience in extraterrestrial environments.

Further Reading: 

• USRA

Human beings evolved on Earth under the 1G pull of gravity. Travelling out into space has profound effects on the body, challenging it in ways that Earth-bound life never does. Microgravity or weightlessness causes muscle atrophy and bone density loss, as the body no longer needs to support its own weight. There is further damage from the prolonged exposure to cosmic radiation which increases the risk of cancer and can damage the nervous system. In addition to this, astronauts experience fluid shifts that lead to vision problems and even cardiovascular changes. Of course this is just the physical aspect but there is a psychological impact too from the isolation and confinement which just adds another level of complexity. Understanding the impacts of space travel is what has driven a team of scientists to try and learn more.

Astronauts exercise for around 2 hours every day on board the ISS

(Credit : NASA)

The team led by Rukmani Cahill from the Blue Marble Space Institute of Science have published their findings in the Public Library of Science. They explored wanted to explore if bone loss during spaceflight in Low Earth Orbit is primarily due to the microgravity induced unloading on weight-bearing skeletal sites.

To test this they sent a plucky bunch of mice off to the International Space Station for 37 days as part of the NASA Rodent Research-1 experiment. The team were then able to analyse the bones from the mice on their return to Earth using microcomputed tomography, a high resolution 3D imaging technique very similar to hospital CT scans but on a much finer scale. They were able to study the bone structure and composition and hoped to understand how spaceflight would effect the integrity of their skeleton.

NASA’s Rodent Habitat module with both access doors open

(Credit : NASA/Dominic Hart)

Their study showed that there was significant bone loss in the femur of the mice but not in vertebrae. This suggests that Low Earth Orbit radiation or systemic stresses aren't major contributors to bone degradation. Interestingly, the microgravity environment actually seemed to accelerate the transformation of cartilage in the rounded upper end of the thigh bone into bone tissue! This seems to indicate that space conditions may promote premature progression of secondary bone formation during late skeletal maturation stages at 21 weeks.

The research also showed a surprising benefit of the ISS Rodent Habitat design: control mice housed in these special wire-mesh enclosures down on Earth maintained or increased their bone mass, while those in standard laboratory cages showed significant bone deterioration. The team attribute this to the enclosures 3D structure, which encourages more elaborate movement patterns increasing mechanical loading on weight-bearing bones, a natural stimulus for maintaining healthy bone density. The outcome demonstrates how environmental design can surprisingly have a positive impact on bone health even under normal gravity conditions.

Concluding their paper, the study reveals that bone loss in space primarily affects weight-bearing sites in nearly mature female mice, while muscle-activated areas like the spine remain largely unaffected. This confirms mechanical unloading as the main culprit rather than radiation or other factors relating to space travel. The team also concluded that microgravity unexpectedly accelerates bone formation in femoral head growth plates, potentially leading to premature cessation of bone lengthening growth, a previously unknown effect of skeletal unloading in space environments.

Source : 

• 37-Day microgravity exposure in 16-Week female C57BL/6J mice is associated with bone loss specific to weight-bearing skeletal sites

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NASA and China plan to send astronauts and taikonauts to Mars in the coming decades. As the next step beyond lunar exploration, all major space agencies hope to send crewed missions there at some point. This should come as no surprise since Mars is the most potentially habitable planet in the Solar System beyond Earth. However, the challenges of sending humans to the Red Planet are legion, including the distances involved. Using conventional propulsion, it would take a mission six to nine months to reach Mars, during which time crews will be exposed to microgravity and elevated radiation levels.

In addition, human explorers will face multiple hazards upon arrival. These include the lower gravity (about 38% that of Earth), radiation, and Martian regolith. Much like lunar exploration, scientists are concerned about the long-term health effects of exposure to this fine, toxic dust. According to a recent study led by researchers from the University of Southern California (USC), long-term exposure to Martian dust could lead to various health problems, including chronic respiratory problems, thyroid disease, and more. 

The research was led by Justin Wang, a medical student at the Keck School of Medicine of USC and an officer in the US Navy Medical Corps. He was joined by fellow researchers from Keck USC, the Laboratory for Atmospheric and Space Physics (LASP) at the University of Colorado Boulder, the University of California Los Angeles (UCLA), and the Astromaterials Acquisition and Curation Office at the NASA Johnson Space Center. That paper that describes their findings recently appeared in the journal Geohealth.

Thanks to the Apollo missions, scientists are familiar with the hazards of lunar regolith. Upon returning to Earth, astronauts reported eye irritation, respiratory irritation, and bronchitis, which was attributed to the dust they tracked back into their lunar landers. Today, scientists, medical professionals, and mission planners have similar concerns about Mars. Much like the Moon, Mars' surface is covered in a fine powder of silicate minerals, iron oxides, sulfates, and toxic elements like beryllium, arsenic, and perchlorates. 

However, the effects of long-term exposure to this dust are less well-understood. As Wang noted in a CU Boulder press release, the greatest concern is the size of dust particulates, which is estimated to measure 3 micrometers in diameter. "That's smaller than what the mucus in our lungs can expel," he said. "So after we inhale Martian dust, much of it could remain in our lungs and be absorbed into our bloodstream." Moreover, crewed missions to Mars will likely involve up to a year and a half of surface operations.

During this time, astronauts must deal with dust storms, which can periodically grow to encompass the entire planet. As a result, they are likely to track some of this dust back into their habitats, where it could be inhaled. As Brian Hynek, a LASP professor of geology and co-author on the paper, said in a UC Boulder press release:

"You're going to get dust on your spacesuits, and you're going to have to deal with regular dust storms. We really need to characterize this dust so that we know what the hazards are. We think there could be 10 meters of dust sitting on top of the bigger volcanoes. If you tried to land a spacecraft there, you're going to just sink into the dust."

To address this, Wang and his colleagues consulted data from Martian rovers and meteorites to gain a better understanding of what composes this regolith. Their study is the first comprehensive examination of the chemical composition of Mars regolith and its possible impacts on human health. Interestingly, their results bore some similarities to common health problems on Earth, which included a condition known as silicosis. This condition, caused by inhaling silicates, leads to the buildup of scar tissue in the lungs and respiratory difficulty.

However, the results were less clear when it came to perchlorates, though there is evidence that suggests that exposure to perchlorates can lead to severe anemia due to their effect on thyroid function. In terms of solutions, Wang and his team recommend that prevention is key, and strategies need to be developed long before astronauts are sent to Mars. These include dust filtration, cabin cleaning, and iodine supplements to increase thyroid function. Said Wang:

"This isn't the most dangerous part about going to Mars. But dust is a solvable problem, and it's worth putting in the effort to develop Mars-focused technologies for preventing these health problems in the first place. Prevention is key. We tell everyone to go see their primary care provider to check [their] cholesterol before it gives you a heart attack. The best thing we can do on Mars is make sure the astronauts aren't exposed to dust in the first place."

Further Reading: 

• UC Boulder, 
• GeoHealth