How space medicine can help humans travel to Mars

In recent years, the dream of stepping onto Mars has shifted away from science fiction and into a serious scientific and cultural pursuit. But despite the immense resources being thrown into this venture, the greatest barrier is not technology alone: it is the vulnerability of the human body.

Space travel reshapes the human physiology in ways that are unpredictable. It can cause damage to bones, muscles, and even the brain, all while exposing astronauts to isolation and dangerous levels of radiation. These risks make Mars' colonization a question not only of rockets and engineering, but of medicine itself.

Can medical science help humans one day live on Mars? Click on to find out.

The challenge of reaching Mars

Mars might one day house humans, but the biggest obstacle is our own biology. The farthest humans have traveled from Earth was the Apollo 13 mission in 1970, which went around the far side of the moon. The problem is that most bodies cannot endure the stresses of spaceflight.

The exclusivity of astronaut health

Astronaut selection has long excluded people with common conditions, like diabetes. Historically, children diagnosed with such illnesses were told they could achieve anything in life, except becoming an astronaut.

The body under microgravity

Living in weightless conditions, like on the International Space Station (ISS), puts severe strain on the human body. Astronauts face risks of bone loss, insulin resistance, and muscle atrophy. This makes spaceflight hostile to normal human physiology.

The urgency of exploration

NASA is planning to send humans to Mars by the 2030s. The planet is incredibly similar to Earth and might once have supported life. In the future, humanity may depend on it for survival.

Musk’s bold vision

Elon Musk has been one of the biggest champions of Martian settlement, and claims that his immense fortune exists solely to fund colonization. His vision includes a million people living in a self-sustaining Martian city by 2050, despite immense obstacles.

Growing consensus on Mars

NASA experts, academics, futurists, and physicians increasingly support Mars' colonization. Many view humanity’s survival as dependent on becoming a multiplanetary species, with Mars being the most logical destination for settlement.

The risk of impatience

Some advocates, like Musk, are pushing for rapid colonization. But critics warn that this haste could be catastrophic, since we barely understand Martian radiation or its environmental risks. Rushing ahead could endanger lives for generations.

Limited astronaut pool

Only about 600 people have traveled to space since Yuri Gagarin became the first in 1961. The small, mostly male sample means data on space health remains limited. This has left many questions unanswered for long-term survival beyond Earth.

NASA’s twin study

In 2019, NASA compared the health of astronaut Scott Kelly, who spent a year on the ISS, with his Earth-bound twin Mark. The experiment revealed surprising physiological differences shaped by space’s unique environment.

Genetic and physical effects

Scott’s telomeres (the bits of DNA at the end of chromosomes) lengthened while he was in orbit, which raised concerns that he had been exposed to cancer-inducing radiation. He also lost body mass, developed cardiovascular issues, and faced short-term cognitive impairment.

The limits of space tourism

Short recreational flights (like the ones taken by Jeff Bezos and Katy Perry) are far from Mars-like conditions. True missions involve toxic dust, minimal gravity, no breathable atmosphere, and long separations from Earth.

Distance and communication

On average, Mars is around 140 million miles (225 million km) away, creating a 20-minute communication delay. In medical emergencies, astronauts could not rely on telemedicine instruction. A mission would require full independence in managing health crises.

Astropharmacy

Humans are still incredibly far from being able to breathe in Mars’ atmosphere, and scientists are now considering space medicine as one primary aspect of survival. Programs are already popping up around the planet, dedicated to preparing health professionals for extraterrestrial care.

Space medicine programs

The University of California, Los Angeles (UCLA) plans a space nursing and paramedic training program, while Europe offers specialized degrees for managing human health in extreme environments.

AI as a medical partner

Artificial intelligence systems, like those developed by Google and NASA, may even guide astronauts in emergencies. These tools could train crews in real time, although concerns about data gaps and accuracy remain unresolved.

Gender gaps in research

Most astronauts are men, which has left vast unknowns about female physiology in space. Critical questions about reproduction, pregnancy, and childbirth in orbit remain unanswered, but are essential if humans hope to develop self-sustaining Martian colonies.

Human reproduction in space

As far as we know, no pregnant human being has ever been to space and no conceptions have occurred in orbit either. But future settlements will require childbirth. Researchers warn that understanding these risks now is vital before humans attempt reproduction off Earth.

Simulating Martian life

NASA is testing long-term isolation effects with simulated Mars missions in 3D-printed habitats. Bed rest experiments also mimic microgravity, and offer insights into how the body adapts to space over time.

Personalized medicine with organoids

Scientists are also creating mini organs from astronauts’ stem cells. These organoids allow testing of treatments on Earth long before missions actually deploy. Scientists can create customized countermeasures like diets or supplements that are tailored to each astronaut’s body.

Broader ambitions for medicine

Advocates hope every medical discipline, from neurology to radiology, will eventually be integrated into space medicine. The field’s growth could make health care in space as diverse as it is on Earth.

The benefits of space research

Skeptics have questioned the value of spending taxpayer money on space health, but space medicine has already transformed life on Earth. Technologies once developed for astronauts have led to advances like MRIs, CT scans, and modern remote health monitoring tools.

Diabetes management in space

In 2023, researchers tested continuous glucose monitors in space. This breakthrough could enable diabetics to safely become astronauts, while also improving understanding of glucose metabolism and insulin resistance on Earth.

Space as a disease accelerator

Then there are conditions like muscular dystrophy or Alzheimer’s that take a long time to develop on Earth. But in microgravity, degeneration accelerates. This allows scientists to study diseases in weeks rather than decades, potentially speeding up medical discoveries.

Radiation and cancer risks

Space radiation is a major concern. Unlike Earth, Mars lacks strong magnetic shielding against extraterrestrial radiation. According to NASA estimates, a three-year mission could increase an astronaut’s lifetime cancer risk by one-third.

Protecting against radiation

Developing radiation protection mechanisms is a top priority in space medicine. Researchers believe solutions will emerge to safeguard astronauts from dangerous exposure, and this may even pave the way for safer public access to space.

Pharmaceuticals in microgravity

Drug production in orbit also shows promise. Some pharmaceuticals can actually be synthesized much better in microgravity, which could potentially improve injectable medicines. Space may become a critical laboratory for pharmaceutical breakthroughs.

Organoids for future treatments

Space-grown organoids could reduce our reliance on animal testing and even allow scientists to regenerate human organs for those who need transplants. Scientists believe they may be able to transplant new livers grown from patients’ own cells within two decades.