Provenance Record

Well-structured News piece (583 words, within the 400-1200 range). Clear Overview / What We Know / What We Don't Know / Why It Matters arc. Appropriate technical depth on foreshock transients, the Hillas limit, and the cross-environment energy scaling, without overstating the result.

All 4 source snapshots read from disk and verified. source-0 (NASA Science, 200): confirms the verbatim 'traveling close to the speed of light near Jupiter were captured by NASA's Juno mission...' quote, the June 3 2026 Nature publication, the 'measured high-speed electrons in Jupiter's foreshock region' and 'reached even higher speeds than Earth's, scaling with the giant planet's larger-sized bow shock' quotes, and the 'this scaling relationship matched cosmic rays seen coming from supernovas across the galaxy...' quote. source-1 (Phys.org, Archive.org fallback, 200): confirms Raptis-led analysis of Juno data, the verbatim 'within this foreshock, transient plasma structures accelerated particles to relativistic speeds', 'the size of such foreshocks scales with the overall size of a shock system and sets a practical upper limit on the achievable particle energy', 'derive a relationship between foreshock transient size and maximum particle energies', the 'extending the results to distant astrophysical shocks requires assumptions beyond direct measurement...' caveat, plus the paper title and DOI 10.1038/s41586-026-10473-z. source-2 (Sci.News, 200): confirms Raptis's Johns Hopkins University Applied Physics Laboratory affiliation, the October 1 2023 observation date, electrons up to 1 MeV, the verbatim 'universal scaling law for the Hillas limit that empirically connects the observable size of a transient to maximum particle energy', the MeV/tens-of-GeV/tens-of-TeV energies across planetary bow shocks / protostellar jets / supernova remnants, and the full formal citation 'Nature 654, 47-51; doi: 10.1038/s41586-026-10473-z'. source-3 (Nature, 3036 bytes): a bot-block 'Client Challenge' page with no article content (redirected to idp.nature.com), as anticipated.

Every quote, number (1 MeV, tens of GeV, tens of TeV, volume 654, pages 47-51, Oct 1 2023, June 3 2026), name (Savvas Raptis, JHU APL), and the Hillas-limit framing traces to a cited, non-blocked source. The summary's two claims (1 MeV in the foreshock; scaling law linking shock size to maximum particle energy) are both supported. No hallucinations detected.

High-quality, fully sourced submission. All four sources read and verified; the auth-walled Nature paper is cited only for bibliographic data that is independently confirmed in accessible sources (Rule 9 PASS). Approved for publication as-is.