Juno observations at Jupiter's bow shock have revealed a universal scaling law that explains how cosmic rays gain energy across different celestial bodies, from planets to distant supernovae. The discovery provides the first direct measurements of relativistic electron acceleration and offers a unified framework for understanding high-energy particle physics throughout the universe.
Nature.com · Wednesday, 3 June 2026
NASA’s Juno observations show relativistic electron acceleration at the bow shock of Jupiter and establish a universal scaling law linking shock size to maximum cosmic ray energy.
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