Space Medicine: The Key to Surviving Mars and Healing Earth

The vision of humans colonizing the Red Planet has long been a staple of cinematic sci-fi, but the transition from movie screen to reality faces a significant biological hurdle. While high-profile figures like Elon Musk continue to advocate for a multiplanetary future, the reality of human physiology suggests that the typical person is not yet equipped for the rigors of deep-space travel.

Elon Musk, the founder of SpaceX, has spent decades promoting the idea of Martian settlement. In 2025, Musk stated his goal of establishing a self-sustaining city on Mars with 1 million human settlers by 2050.

However, the path to this futuristic society is complicated by the strict medical requirements of spaceflight. Shawna Pandya, the director of the Space Medicine Group at the International Institute for Astronautical Sciences (IIAS), notes that the journey to becoming an astronaut is littered with the hopes and dreams of medically disqualified candidates.

The Rise of Celebrity Space Tourism

While professional astronauts are selected for peak health, the emergence of space tourism is introducing a broader range of human biology into the orbit. Wealthy civilians and celebrities have begun taking short, recreational trips into space via Jeff Bezos’s company, Blue Origin.

Recent passengers have included Teenage Dream singer Katy Perry, as well as CBS Mornings co-host Gayle King and Jeff Bezos himself. These short jaunts, often lasting only 10 to 15 minutes, provide scientists with a unique opportunity to study how individuals with various medical conditions manage in a space environment.

Haig Aintablian, director of the UCLA Space Medicine Program, views this increase in civilian access as a vital opportunity for researchers to study the medical management of a wider array of health conditions beyond the limited sample size of professional astronauts.

The Biological Barriers to Mars

Despite the glamour of celebrity spaceflight, the challenges of a long-term mission to Mars are far more severe. Unlike the short trips provided by Blue Origin, a crewed mission to Mars would likely take at least nine months just to reach the planet, with total missions potentially lasting up to three years.

The environment on Mars is hostile, featuring toxic dust, a lack of a breathable atmosphere, and only 40 percent of Earth’s gravity. Mars lacks the planet-wide magnetic field that protects Earth from harmful radiation.

The physical toll of such a journey is immense. Astronauts in microgravity conditions, such as those on the International Space Station (ISS), face increased risks of:

• Significant loss of muscle mass
• Early-onset osteoporosis
• Insulin resistance

Because of these risks, government agencies maintain strict medical disqualification criteria. Common reasons for disqualification include:

• Tobacco use
• Asthma and sleep apnea
• Hypertension
• Autoimmune disorders
• Migraines
• Anxiety and depression
• Temporomandibular joint (TMJ) disorders

Biologist Kelly Weinersmith, co-author of A City on Mars: Can We Settle Space, Should We Settle Space, and Have We Really Thought This Through?, argues that attempting to settle Mars on Musk’s proposed timeline could be catastrophic without a deeper understanding of these risks.

The New Frontier of Space Medicine

To bridge the gap between sci-fi ambition and biological reality, the field of space medicine is expanding. New educational paths are emerging, including a European master’s program called SpaceMed and planned space nursing and paramedic training at UCLA.

Technology is also playing a central role. Google and NASA have collaborated on an AI system designed to help astronauts diagnose and treat medical conditions during flight when telemedicine is unavailable due to communication delays.

Current efforts are also focused on personalized medicine. Maedeh Mozneb, a project scientist at Cedars-Sinai Medical Center, describes the use of avatars—3D tissue cultures called organoids created from an astronaut’s own stem cells. These miniature organs allow scientists to test personalized countermeasures, such as supplements or workout plans, before the astronaut ever leaves Earth.

The Artemis II mission is currently conducting experiments to further this research. These include the Artemis Research for Crew Health & Readiness (ARCHeR) study, which monitors health as humans travel further into space, and the A Virtual Astronaut Tissue Analog Response (AVATAR) experiment, which aims to help create personalized medical kits.

The biggest problem for humanity to solve is the guaranteed survival of our species — which the logical answer is to become multiplanetary. I don’t think there’s a better solution than Mars.

Haig Aintablian

From Red Planet to Blue Planet

While the goal of Martian colonization remains a distant and difficult prospect, the research driving space medicine is already providing benefits for people on Earth. Remote health monitoring tools and advancements in digital imaging used during the 1972 Apollo 17 mission eventually contributed to the development of MRIs and CT scans.

Recent breakthroughs also include the demonstration of a continuous glucose monitor in spaceflight environments in 2023. This development could eventually allow people with Type 1 diabetes to travel to space and helps researchers better understand glucose metabolism on Earth.

the study of muscle loss in microgravity is helping scientists understand conditions like Duchenne’s muscular dystrophy, while the accelerated progression of certain diseases in space is being used to study neurodegenerative conditions like Alzheimer’s.

As the industry looks toward the future—including the potential for space hotels—the focus remains on ensuring that the humans who venture into the void can do so safely.