Skip to main content

Astronauts traveling to Mars may be permanently damaging their brains

mars cosmic radiation brain damage nasa rover feat
From no gravity to difficult repairs, astronauts in deep space must deal with a host of problems that challenge their mental and physical strength. And this list just got longer thanks to a new study that suggests these deep space missions can cause brain damage that persists even when the space traveler returns back to Earth.

A new study by a team of radiation oncologists and neurobiologists from the University of California, Irvine, and the Eastern Virginia Medical School paint a potentially troubling picture for astronauts hoping to make the trip to Mars. Working with adult male Wistar rats, the team discovered that long-term exposure to cosmic radiation affected the ability of the rodents to perform basic tasks, such as distinguishing between a familiar object and a newly introduced object.

Related Videos

These behavioral and cognitive issues were linked to physical changes in the brain, including the modification of the neurons and a breakdown in the integrity of the synapses that control the transfer of neurotransmitters between the neurons.

Not only were these effects seen in the presence of cosmic radiation, but they also persisted for more than six months after the radiation exposure was over. Laboratory examination of the irradiated rats showed both a decrease in synaptic integrity and an increase neuronal in inflammation which influenced both learning and memory.

These long-term changes appeared to be permanent with no observed attempt by the body to repair or regenerate the damaged brain components. This negative effect on the brain was most pronounced at acute levels of cosmic radiation exposure but was also recorded at low dosages. In these low-dose trials, the cognitive effects of radiation, though less severe,  still were detectable at both 12 weeks and 24 weeks after the initial exposure.

So what does this mean for potential Martian astronauts? A lot. Even though the study uses a rat model, the scientists conducting the research believe a human brain would respond in the same negative way as the rat brains in the study. “The most logical conclusion to draw from these studies is that cosmic radiation exposure poses a real and potentially detrimental neurocognitive risk for prolonged deep space travel,” write the researchers in an article recently published in Nature.

Though the results are concerning, they should not put an end to the Mars missions, argues University of California Neurobiologist Charles Limoli. “This is not a deal-breaker,” said Limoli to Popular Science. “I do not think that during a trip to Mars and back the astronauts will come back with anything remotely similar to full-blown Alzheimer’s.

But more mild changes, more subtle changes — they would still be concerning, given the level of autonomy astronauts operate under and the amount of work they have to do.” Due to the seriousness of the effect, NASA and other agencies planning for a journey to Mars may have to develop creative ways of protecting astronauts from cosmic radiation, either through the use of cutting-edge shielding or by administering a drug cocktail that reverses these negative effects on the brain.

Editors' Recommendations

Here are some of the scientific highlights from the ISS in 2021
NASA astronauts Anne McClain and Serena Auñón-Chancellor during operations for the MICS experiment, which examined solidification of cement in microgravity.

One of the primary functions of the International Space Station (ISS) is to provide a venue for scientific research into a whole host of topics that benefit from investigation in a microgravity environment. To ring in the new year, NASA has released a round-up of some of the biggest scientific discoveries made on the ISS in 2021.

Much of the research done on the ISS is about health issues that affect both astronauts and those on the ground. Some of the experiments done in human health included investigating bone loss, which is a problem for astronauts who stay in space long-term and lack the effects of gravity on their weight-bearing bones. Bone loss is also a problem for those on Earth with various medical conditions, especially older adults. A study using data from the ISS was able to predict bone loss based on biomarkers and exercise history, which can help in the identification of astronauts at particular risk for bone loss. In the long term, it could help create better exercise regimens for astronauts as well.

Read more
OxeFit XS1 tracks your workout form and suggests real-time improvements
OxeFit XS1 smart home gym, front view

We’re all familiar with the concept of at-home workouts: Whether your memory goes back to Jane Fonda, or you’re more the type to follow along to Demi Bagby on TikTok, the idea of a private, but just-for-you workout is an enticing way to embrace fitness. Particularly considering how hard COVID-19 has been on gyms and in-person training, a dedicated at-home workout concept seems to make sense.

OxeFit has unveiled its first smart, at-home fitness system, the XS1 which the company says now combines strength, cardio, balance, and immersive interactive fitness training all in a single apparatus. Think of it as a better-than-Bowflex home gym for the pandemic generation, featuring sensors, cameras, and real-time feedback on your workouts, positioning, and results.

Read more
Astronauts’ squashed eyeballs may be helped by a high-tech sleeping bag
A high-tech sleeping bag for astronauts.

In space, squashed eyeballs are a real and present danger.

The disorder, known as spaceflight-associated neuro-ocular syndrome (SANS), can adversely affect an astronaut’s vision during a lengthy mission such as a six-month stay aboard the International Space Station (ISS). More than half of returning crewmembers exhibit signs of the condition to some degree.

Read more