NASA’s Artemis Radiation Vest Could Cut Moon Astronaut Exposure by 60% During Solar Storms

NASA’s Artemis program may have found a powerful new defense against one of the biggest dangers facing astronauts on the Moon: extreme radiation.

A new study suggests that a protective radiation vest tested aboard NASA’s Artemis I mission could reduce astronaut radiation exposure by roughly 60% during a solar storm as powerful as the 1972 event and by nearly 40% during conditions similar to the 1989 solar storm.

The findings, published in Science Advances, could have major implications for NASA’s plans to establish a sustained human presence on the Moon.

A Dummy Took the Vest Around the Moon

No astronauts were aboard Artemis I, NASA’s first Artemis test flight around the Moon in 2022. Instead, the Orion spacecraft carried two female manikins named Zohar and Helga.

Zohar was equipped with the 57-pound (26-kilogram) AstroRad radiation vest, while Helga traveled without the protective garment. Both manikins contained thousands of radiation sensors, allowing researchers to compare radiation exposure throughout the mission.

The vest was developed by U.S.-Israeli startup StemRad in partnership with Lockheed Martin and was designed to protect some of the body’s most radiation-sensitive organs.

Its coverage includes the lungs, stomach, bone marrow, breasts and ovaries — areas considered particularly vulnerable to radiation exposure.

Solar Storms Are a Serious Threat

Space may look empty, but astronauts outside Earth’s protective atmosphere and magnetic field face potentially dangerous radiation from the Sun and deep space.

A powerful solar particle event could expose lunar astronauts to radiation levels capable of causing serious health consequences.

The researchers therefore used Artemis I measurements to simulate what would have happened during historically powerful solar storms.

The results were striking.

During a solar event comparable to the massive 1972 solar storm, the vest could reduce radiation exposure by around 60%.

For an event resembling the 1989 solar storm, researchers estimated protection of nearly 40%.

Scientists said those reductions are equivalent to avoiding approximately 193 days of unnecessary deep-space radiation exposure in the 1972 scenario and 131 days in the 1989 scenario.

The Timing Could Be Critical for NASA’s Moon Base

The Apollo astronauts never spent more than about two weeks on the lunar surface. Future Artemis missions could be dramatically different.

NASA’s long-term vision involves astronauts spending weeks or even months around the Moon as infrastructure for a sustained lunar presence develops.

That means astronauts could eventually face a much greater chance of being caught outside a heavily shielded habitat during a major solar event.

A lightweight radiation vest could provide an additional layer of protection, potentially allowing astronauts to shelter quickly or continue essential activities during dangerous periods.

The researchers also noted that women may face particular risks from radiation-induced cancer, making targeted protection of sensitive organs especially important.

Artemis I Delivered a Massive Radiation Dataset

The study’s lead author, StemRad’s Jordan Houri, described the experiment as the largest effort to measure astronaut radiation exposure beyond low-Earth orbit.

Artemis I provided researchers with valuable data from Orion’s journey through the inner Van Allen radiation belt and its trip around the Moon and back.

Fortunately, the spacecraft did not encounter a major solar outburst during the mission.

That allowed scientists to combine the real-world radiation measurements with simulations of extreme historical solar events.

One of the most famous examples occurred in 1972, when an enormous solar eruption happened between the Apollo 16 and Apollo 17 lunar missions. Had astronauts been exposed to the event while on the Moon, the radiation could have posed a potentially lethal danger.

NASA Wants the Vest to Get Lighter

The current AstroRad vest is heavy, weighing about 57 pounds.

For astronauts already carrying life-support equipment, tools and other mission hardware, every additional kilogram matters.

Researchers are therefore working to reduce the vest’s weight without sacrificing its radiation protection.

Scientists are also investigating whether materials already available aboard spacecraft could be transformed into emergency radiation shielding.

That approach could provide an important advantage: instead of launching additional shielding from Earth, future crews could reuse existing spacecraft materials to create safer shelters.

Mars Could Make Radiation Protection Even More Important

The technology could eventually become even more valuable beyond the Moon.

A trip to Mars would expose astronauts to radiation for far longer than a typical lunar mission. A Mars expedition could last months or years, making radiation protection one of the central challenges of human deep-space exploration.

The Artemis radiation experiment therefore represents more than a test of one piece of equipment.

It is part of a larger effort to answer a fundamental question before humans venture farther into space:

How do we keep astronauts alive when Earth’s natural radiation shield is millions of miles behind them?

For now, Zohar and her AstroRad vest have returned from their historic lunar journey and are on display at Kennedy Space Center in Florida, where Artemis I began its mission.

But the data collected around the Moon could help shape the protective gear worn by the next generation of lunar explorers — and potentially the first humans to set foot on Mars.

The Digginator Take: The Moon’s biggest danger may not be the lunar landscape itself, but the invisible radiation surrounding it. If a wearable shield can cut exposure by up to 60% during extreme solar storms, NASA may have a crucial piece of the puzzle for keeping future lunar crews alive.