NASA Sends Human Tissue to Moon on Artemis II Mission

The 'Avatar' payload will study cosmic radiation's impact on human cells during the historic lunar flyby.

Apr. 5, 2026 at 3:36am

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NASA is sending a sample of living human tissue, dubbed the 'Avatar' payload, on the Artemis II mission - the first crewed lunar flight since Apollo 17 in 1972. The tissue will absorb cosmic radiation during the 10-day journey around the Moon, providing crucial data on how deep space exposure affects human biology. This is part of NASA's effort to better understand the medical risks of long-duration space travel as the agency prepares for future missions to the Moon and Mars.

Why it matters

The radiation environment beyond low Earth orbit is significantly more hazardous than what astronauts experience on the International Space Station. The Artemis II mission represents the first opportunity since the Apollo era for NASA to gather biological data on how humans respond to deep space radiation. This information is critical as the agency plans longer lunar surface stays and eventual crewed missions to Mars.

The details

The Avatar payload will travel alongside the four-person Artemis II crew - Commander Reid Wiseman, Pilot Victor Glover, Mission Specialist Christina Koch, and Canadian Space Agency astronaut Jeremy Hansen. While the astronauts navigate the Orion spacecraft, the tissue sample will absorb cosmic rays and solar particles, allowing researchers to study the molecular-level impact on human cells in real time. Current estimates suggest the crew could be exposed to the equivalent of several hundred chest X-rays over the course of the 10-day mission.

  • The Artemis II mission is scheduled to launch in 2026.
  • The Orion spacecraft will spend 10 days in lunar orbit before returning to Earth.

The players

NASA

The U.S. National Aeronautics and Space Administration, the federal agency responsible for the country's civil space program, aeronautics research, and space exploration.

Artemis II Crew

The four-person crew of the Artemis II mission, including Commander Reid Wiseman, Pilot Victor Glover, Mission Specialist Christina Koch, and Canadian Space Agency astronaut Jeremy Hansen.

Avatar Payload

A sample of living human tissue that will travel aboard the Artemis II mission to study the effects of deep space radiation on human biology.

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What’s next

NASA has stated that future crewed missions beyond Earth orbit are expected to include a physician as a permanent crew member to address the medical demands of deep-space travel. The data gathered from the Avatar payload on the Artemis II mission will help inform these future medical requirements.

The takeaway

The Avatar payload is a candid acknowledgment that NASA still has much to learn about the biological impacts of deep space radiation as it prepares for increasingly ambitious lunar and interplanetary missions. By sending a piece of human tissue to the Moon, the agency is taking an important step toward better understanding and mitigating the medical risks facing future astronauts.