Sample Page Title

Editor’s be aware, April 7, 2026, 5:10 pm ET: The Artemis II mission is conducting experiments which will radically advance our understanding of area medication. The findings of A Digital Astronaut Tissue Analog Response (AVATAR) experiment may assist us create customized medical kits for astronauts, and the Artemis Analysis for Crew Well being & Readiness (ARCHeR) research will monitor the astronauts’ well being as they go additional into area than any human beings have gone earlier than. As we await the findings of these experiments, Vox is republishing this text, which initially launched September 24, 2025.

Vox Members received to learn this story first. Assist unbiased journalism and get unique entry to tales like this by turning into a Vox Member immediately.

In the future, Mars may grow to be a house to people. However first, there’s the cinematic, sci-fi problem of creating the Pink Planet appropriate for all times. There’s an issue, although: The everyday particular person can’t get to area safely. That throws a wrench into the entire “let’s transfer to Mars” plan within the face of maximum local weather change and different existential dangers on Earth.

At this time, the trail to turning into an astronaut is “suffering from the hopes and desires of medically disqualified candidates,” stated Shawna Pandya, a analysis astronaut with the Worldwide Institute for Astronautical Sciences (IIAS) and the director of its House Medication Group. “As soon as upon a time, children being recognized with Sort 1 diabetes within the physician’s workplace could be advised, ‘Nicely, you possibly can nonetheless be something, besides an astronaut.’”

Astronauts inherently aren’t consultant of the broader inhabitants — they’re chosen for being in excellent well being. The stress of present in basically weightless microgravity circumstances, like these on the Worldwide House Station (ISS), could be extremely powerful on the human physique. Astronauts face heightened dangers of early-onset osteoporosis, insulin resistance, and important muscle mass loss. Naturally, authorities area companies need folks whose our bodies are extra resilient to such pressures, and who can carry out crucial duties with no ton of medical intervention.

In response to Haig Aintablian, director of the UCLA House Medication Program, “simply as being pregnant causes the physique to bear complicated and distinctive adjustments, spaceflight additionally produces distinct and important physiological adjustments.” It additionally requires its personal medical specialty to handle (aptly known as area medication).

There’s lots scientists don’t know, from the bodily to the psychological. That’s an issue — for the way forward for science, area journey, and possibly even human existence at massive.

NASA needs to go to Mars for analysis, and goals to ship people there as early because the 2030s. As probably the most comparable planet to Earth in our photo voltaic system, Mars might have as soon as harbored life, or might even at present. And sooner or later, we might even want it to assist us.

A long time in the past, critically participating with the concept of shifting to Mars was extraordinarily fringe for a mess of causes, starting from a scarcity of technical feasibility to the will to place scientific assets towards fixing issues on Earth. Elon Musk — founding father of the spaceflight firm SpaceX — grew to become a famed advocate for colonizing Mars within the early 2000s. He nonetheless is. Musk, who’s at present price round $410 billion, claims that he’s solely accumulating belongings for the aim of Martian area settlement. Final yr, he stated that he needs 1 million human settlers on the Pink Planet in a self-sustaining metropolis by 2050.

Now Musk isn’t alone. NASA consultants, biologists, lecturers, futurists, catastrophe resilience researchers, and physicians are critically contemplating the potential for making humanity an interplanetary species.

“The largest drawback for humanity to unravel is the assured survival of our species — which the logical reply is to grow to be multiplanetary,” Aintablian stated. “I don’t suppose there’s a greater resolution than Mars.”

Whereas we all know a number of the well being results of being on the ISS, we will’t actually replicate the results of Martian radiation publicity. Kelly Weinersmith — a biologist and co-author of A Metropolis on Mars: Can We Settle House, Ought to We Settle House, and Have We Actually Thought This By way of? — thinks that settling Mars on Musk’s timescale can be catastrophic. She argues that we shouldn’t rush to arrange store earlier than understanding — and mitigating — the dangers, even when this takes centuries slightly than a long time.

However many advocates for settling Mars are way more impatient. The one technique to get there safely could be to unlock important advances in area medication, a nascent subject that has simply barely scratched the floor in its roughly 75-year historical past.

“Nothing that humanity has accomplished that has been worthwhile has been simple,” Aintablian advised me. “A lot in our improvement as a civilization has been tough, and the explanation why we’re in a position to stay such comfy lives now could be due to the extraordinarily tough challenges that people have needed to clear up prior to now.”

What we all know — and don’t — about human well being on Mars

Since extraordinarily few folks find yourself in area proper now, the researchers attempting to know easy methods to enhance human well being there have a restricted pattern measurement to work with. Yuri Gagarin grew to become the primary human in area in 1961, and greater than 600 astronauts have adopted him. Solely a couple of sixth of them are girls.

NASA researchers have recognized some key ways in which time in area can impression human well being — radiation exposures, isolation, distance from Earth, altered gravity, and environmental penalties like an altered immune system. However we’re nonetheless missing many particular examples of how these totally different dynamics play out in actual life.

Among the best research we have now is NASA’s well-known 2019 twins research. Twin research permit researchers to separate the results of genetic predispositions from environmental influences on well being outcomes. NASA in contrast the well being of an identical twin brothers Scott and Mark Kelly over the course of a yr. Scott went into orbit on the ISS whereas Mark remained on Earth. Each underwent the identical battery of physiological checks, and the outcomes indicated some shocking new variations between the 2 males.

Scott’s telomeres — the bits of DNA on the finish of our chromosomes — lengthened whereas he was in area and (principally) reverted to regular as soon as he returned to Earth, probably indicating radiation-induced DNA harm and potential elevated most cancers threat. Scott additionally misplaced physique mass, developed indicators of cardiovascular harm that weren’t current in Mark, and skilled some short-term cognitive adjustments after returning to Earth.

Whereas survivable with the precise coaching, tools, and precautions, the dual research demonstrated how area’s distinctive surroundings can have important penalties for gene expression and total well being whereas in orbit.

If the most effective of the most effective wrestle, what about the remainder of us? We’re getting some insights right here now, too.

Since area tourism has actually taken off, astronauts aren’t the one ones going to area now: Rich non-astronauts, like Jeff Bezos, Gayle King, and Katy Perry, have lately taken quick, leisure jaunts into outer area via Bezos’s area tech firm, Blue Origin.

Aintablian may be very excited concerning the prospect of civilian entry to area rising, which can inherently imply folks with medical points are additionally flying. This represents an enormous alternative for scientists to check the medical administration of a a lot wider vary of circumstances.

That stated, 10 or quarter-hour in area is hardly akin to the circumstances on the ISS. And Mars poses even worse penalties when it comes to hostile environments and time spent away from Earth. Mars has poisonous mud, lacks vegetation and a breathable environment, and solely has about 40 p.c of Earth’s gravity. Earth’s international magnetic subject protects our planet from dangerous radiation, and the Martian counterparts are localized, not planet-wide.

The longest time somebody has been in area consecutively is 438 days aboard an area station. However crewed missions to Mars would most likely take at the least 9 months simply to get there, not to mention keep or journey again (which may take as much as three years). Mars is often round 140 million miles from Earth primarily based on its orbital path across the solar, with as much as a 20-minute communication delay a method. In the event that they skilled a medical emergency, astronauts possible wouldn’t be capable to entry telemedicine directions in time, and so they couldn’t flip again round for therapy.

A crewed mission to Mars must take all of their provides with them earlier than they left our planet. And when the primary folks heading to Mars set foot on the planet, they received’t have entry to the extraordinary assist astronauts obtain when touchdown again on Earth.

Attending to Mars is barely a part of the problem. We’ve been to area, however to this point, people have solely ever despatched robots to the Pink Planet. We’re making educated guesses at what Mars is like for residing issues. Earth analogues aren’t in a position to actually replicate the closed, hostile circumstances of the area surroundings, which might wreak havoc on astronauts’ psychological well being. Desert analysis stations have an environment, whereas the moon barely has one — and organising that modest base was an enormous mission in its personal proper. Weinersmith advised me that scientists at polar analysis stations are remoted in distant, inhospitable environments, however they’ll “nonetheless open the door, take a deep breath, and never die.”

Medication’s new frontier

We’re nonetheless fairly removed from with the ability to breathe in Mars’ environment — but it surely would be good to get there someday and easily not die.

Applications devoted to determining easy methods to get people safely into area for lengthy durations of time are popping up, and non-physician well being care suppliers are getting in on the motion too. UCLA is planning to launch an area nursing program and probably area paramedic coaching. SpaceMed is a European grasp’s program centered on human well being in spaceflight and different excessive circumstances.

At this time, astronauts obtain most of their care from Earth-based aerospace medication physicians known as flight surgeons via telemedicine. Aintablian envisions a future the place well being care suppliers immediately accompany astronauts on their expedition-class missions, prefer to the moon or Mars. Synthetic intelligence can act as a useful resource for the on-board flight surgeon, he predicted, and help within the improvement of different applied sciences that can convey us nearer to Mars.

Such know-how is already within the works. Google lately collaborated with NASA to develop an AI system that might information astronauts in diagnosing and treating medical circumstances that come up in-flight after they lack entry to telemedicine.

However the satan is within the particulars, Pandya advised me. AI might help with just-in-time coaching for medical emergencies and diagnostics, however the knowledge necessities could be large. Since extraordinarily few folks find yourself in area — and those who do are overwhelmingly male — fashions could be educated on an unrepresentative dataset that might result in inaccurate predictions of physiological adjustments in area. These kinks have to be labored out first.

Proper now, there’s a gendered hole within the analysis — a lot in order that Weinersmith advised me there’s by no means a line to the ladies’s restroom at area settlement conferences. Human replica and improvement in area, consequently, is wildly understudied.

So far as we all know, no human being has ever been to area whereas pregnant, and we don’t know of any people who’ve been conceived in area. We’re going to study lots about replica on Earth from the primary human area being pregnant and area start, a prerequisite for a self-sustaining settlement on Mars. (Plus, area tourism firms are speaking about resorts in area, and we all know what folks do in resorts.) Ideally, you wish to have an thought of what is going to occur to somebody giving start in area earlier than they really undergo it.

“What we’re arguing is that we must always do the analysis to know these dangers earlier than we go on the market as a result of if there are large dangers, there often are technological options for a few of these,” Weinersmith stated.

NASA will start its second Crew Well being and Efficiency Exploration Analog this October, a year-long “mission” to Mars in a 3D-printed habitat at Johnson House Heart in Houston, the place it would accumulate behavioral well being knowledge on the results of isolation and confinement. Scientists are conducting mattress relaxation research, which simulate the physiological results of altered gravity and weightlessness. And as funding cuts rework the way forward for scientific analysis on Earth and past, area medication researchers are amongst these advocating for continued funding in area and biomedical science.

Maedeh Mozneb, a biomedical engineer and challenge scientist within the Sharma Lab at Cedars-Sinai Medical Heart, advised me that the last word aim is to ship “avatars” of astronauts to area by taking their stem cells and creating 3D tissue cultures known as organoids that characterize totally different components of their physique — sure, miniature hearts, kidneys, and even brains created from Earth-dwelling people. From there, scientists can decide customized countermeasures reminiscent of exercise plans or dietary supplements tailor-made to every astronaut’s wants, earlier than they really find yourself in area.

The hope, for these area medication physicians like Pandya, is that in a spacefaring future, all medical disciplines — from neurology to radiology — can be represented in area medication.

House medication analysis and observe isn’t low cost. “I usually get requested,” stated Pandya, “‘Why are you spending cash on area well being when we have now all of those issues on Earth?’” However that’s the fallacious manner to consider it, she stated.

Analysis performed in area has already improved well being on this planet. Advances in digital imaging for moon images in the course of the 1972 Apollo 17 mission later performed an important position in CT scans and MRIs. Distant well being monitoring instruments designed for astronauts in area are actually broadly utilized in hospitals.

House medication analysis will even permit extra folks to go to area. In 2023, Pandya’s workforce demonstrated the protection and performance of a steady glucose monitor within the spaceflight surroundings. This might finally permit diabetics to test their blood sugar in area. It has implications for present astronauts, who can develop insulin resistance and pre-diabetes signs in longer-duration spaceflights. The kid recognized with Sort 1 diabetes who needs to be an astronaut may very well have the possibility to stay out their dream now, and learning how the physique metabolizes glucose in area helps us higher perceive well being on Earth.

Then there are the ailments that take a long time to unfold. Muscle loss in area might help scientists higher perceive easy methods to deal with circumstances like Duchenne’s muscular dystrophy. On Earth, neurodegenerative ailments like Alzheimer’s usually aren’t obvious till an individual is of their late 60s.

In microgravity, stated Shelby Giza, the director of enterprise improvement at House Tango, an organization that facilitates automated analysis and improvement in microgravity circumstances, “you’ll be able to see that type of illness output in a matter of weeks.” Analysis on these circumstances could be performed a lot sooner — and hopefully speed up the tempo of medical breakthroughs.

The identical could be stated for most cancers. Not all radiation exposures are made equal, and susceptibility to the dangerous results of radiation varies between people. For the reason that ISS is inside the safety of Earth’s magnetosphere, it’s not the most effective comparability to the elevated radiation ranges astronauts would face on Mars.

In response to former NASA astronaut and biologist Kate Rubins, most astronauts are wholesome folks of their 30s and 40s, an age when most cancers usually doesn’t develop. Scientists should observe astronauts for many years after their final spaceflight to see if most cancers or different antagonistic well being circumstances happen. NASA’s Lifetime Surveillance of Astronaut Well being program, which is voluntary for former astronauts and never particular to most cancers alone, screens the well being standing of individuals like Kelly and Rubins for the remainder of their lives.

Publicity to area radiation is linked to creating most cancers and degenerative ailments. To mitigate the danger of creating deadly cancers, NASA at present limits astronauts’ spaceflight radiation publicity to 600 millisieverts (mSv) — roughly the equal of 60 CT scans of the torso and pelvis — over the course of their complete profession. A 2023 NASA white paper estimates {that a} wholesome astronaut may have a 33 p.c elevated threat of dying from most cancers of their lifetime after a 1,000-day mission to Mars.

One of many subsequent massive issues in area medication “might be going to be the event of radiation safety mechanisms,” Aintablian advised me. “I do imagine that with the quantity of emphasis being positioned on radiation safety, we’re going to determine methods to really defend towards important quantities of radiation for most of the people for a number of makes use of.”

Whereas it’s nonetheless comparatively early days for the area pharma business, life science firms are taking be aware, seeing microgravity as a platform for higher drug discovery.

Like fiber optic cables used for telecommunications, some prescribed drugs are higher synthesized in microgravity circumstances. Scientists can produce extra uniform protein crystals in microgravity, which might enhance drug injectability and scale back the necessity for refrigeration.

Raphael Roettgen, an entrepreneur and the co-founder of area biotech startup Prometheus Life Applied sciences, advised me that organoids — these 3D cell fashions replicating human organs — develop extra cleanly in area with out Earth’s gravity weighing them down. Derived from non-embryonic stem cells, these miniature organ fashions have large potential for customized medication.

Roettgen hopes that human area organoids may scale back the necessity for animal testing within the close to time period. Finally, he hopes that new organs might be regenerated for sufferers needing transplants. For the reason that new tissue could be derived from the affected person’s personal stem cells, there wouldn’t be a threat of immune rejection, saving transplant sufferers astronomical prices and immense struggling. He estimates that liver regeneration and transplants from these organoids may grow to be a actuality in sufferers inside the subsequent 20 years.

Microgravity is an “costly software,” however an essential one nonetheless, stated Mozneb, who research the results of low earth orbit on stem cell differentiation. She hopes rising commercialization and new applied sciences will considerably lower the price of launching experiments into orbit over the following 10 years.

What we already learn about area medication is a drop within the ocean of what we’ll uncover as extra folks — astronauts and in any other case — enterprise into area.

“It’s like in case you had been learning genetics again within the ’90s,” Mozneb stated. “All the things is a discovery.”