Moon Exploration Space Exploration & Science Missions NASA

Artemis I measurements found lunar radiation higher than in Earth orbit, but less elevated than expected

Radiation measurements aboard the uncrewed Orion spacecraft during NASA’s Artemis I mission found that cosmic radiation near the Moon exceeds levels in Earth orbit, though by less than scientists might have anticipated. The data add to the evidence needed to assess radiation exposure on future crewed lunar missions.

Discovered 2026-10-28T06:35:01.092056-07:00 | 2026-10-28T06:35:01.092056-07:00

Briefing

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Radiation exposure is a key constraint for crewed lunar missions; Artemis I’s measurements provide data from Orion’s environment near the Moon.
The reported levels were higher than in Earth orbit, but not as high as scientists might expect, sharpening the evidence base for evaluating lunar mission risks.

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