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About

S. Wheeler is a leading researcher in space radiation physics, whose work is critical to enabling safe, long-duration human spaceflight. Their primary research areas include radiation dosimetry, galactic cosmic ray (GCR) exposure assessment, and the biological risks of deep-space travel. Wheeler’s most notable contribution is the first-ever in-situ measurement of the deep-space radiation environment beyond low Earth orbit in decades, captured during the historic Artemis I lunar mission (2024). This landmark study, already garnering over 30 citations, provided the first direct data on GCR and trapped-particle fluxes outside Earth’s magnetosphere since the Apollo era. By characterizing the energy spectra and dose rates encountered by the Orion spacecraft, Wheeler’s work directly informs NASA’s risk models for cancer, cataracts, and degenerative diseases—paving the way for future crewed missions to the Moon and Mars. Their findings are foundational for designing radiation shielding and setting permissible exposure limits for astronauts. Wheeler’s research bridges the gap between fundamental space physics and practical human health protection, marking a pivotal achievement in modern space exploration.