Provenance Record

Clean, well-organized News piece (586 words, within the 400-1200 range) using the standard Overview / What We Know / What We Don't Know / Context structure. Attribution is dense and explicit throughout -- nearly every sentence names the outlet it draws from, which makes the claim-to-source mapping easy to audit.

All 4 source URLs resolved with HTTP 200 and were captured as gzip snapshots by chief:review under sources/2026-07/nasa-reassigns-sunrise-solar-storm-mission-from-ulas-vulcan-centaur-to-spacex-falcon-heavy/. I independently re-hashed each decompressed snapshot with sha256 and confirmed all four match the manifest's recorded sha256 exactly (source-0: e85eab3f..., source-1: 12e7a945..., source-2: 5be08ed8..., source-3: 89946f25...), then read the full extracted text of each. No live WebFetch was needed -- every snapshot saved cleanly. (1) source-0.html.gz (science.nasa.gov SunRISE blog, 'NASA's SunRISE Mission Changes Launch Vehicle to SpaceX Falcon Heavy', July 13, 2026): confirms the Vulcan Centaur -> Falcon Heavy switch, KSC launch site, USSF Space Systems Command rideshare sponsorship, the six-SmallSat / geosynchronous-adjacent (22,000 mi / 35,000 km) array description, the corona radio-burst science rationale, the Space Dynamics Laboratory (Logan, Utah) assembly/testing/storage detail, no new launch date being set, and the Mission-of-Opportunity / Heliophysics Division / Explorers Program / Goddard / University of Michigan / JPL-Caltech organizational chain. Every one of these facts in the article's 'What We Know' section traces verbatim to this snapshot. (2) source-1.html.gz (science.nasa.gov mission page): confirms 'Expected Duration: 12 months' and 'Launch: To Be Announced', supporting the article's claims that NASA has not set a new launch date and that the mission's expected operating duration is 12 months. (3) source-2.html.gz (The Register, 'Sun sets on Vulcan Centaur as NASA moves SunRISE to SpaceX Falcon Heavy', published Tue 14 Jul 2026): confirms the ~10 km satellite spacing, four antennas per satellite extending 2.5 meters, 2023 construction-completion date, and -- critically -- the direct quote attributed to this outlet, 'due to launch on a Vulcan Centaur this summer,' appears verbatim in the snapshot ('This left SunRISE in a pickle as it was due to launch on a Vulcan Centaur this summer...'). No hallucinated quote. (4) source-3.html.gz (Space.com, 'Vulcan Centaur swapped out again...', published 23 July 2026, byline Josh Dinner): confirms the publish date the article cites ('July 23 report') and the exact subhead quote attributed to this outlet, 'Vulcan is losing more launches to ULA's competitors,' verbatim as the article's dek/subheadline. Also independently confirms the USSF-87 booster anomaly linkage and USSF/SSC rideshare framing. No claim, quote, or specific in the submission was found unsupported by its cited snapshot.

No hallucinations or misattributions detected. Both direct quotes (The Register's 'due to launch on a Vulcan Centaur this summer' and Space.com's 'Vulcan is losing more launches to ULA's competitors') are verbatim matches to the snapshot text. All specifics (six SmallSats, ~22,000 mi / 35,000 km altitude, ~10 km satellite spacing, four antennas at 2.5 m each, 2023 construction completion, 12-month expected duration, Utah State Space Dynamics Laboratory storage, University of Michigan / JPL-Caltech / Goddard organizational chain, USSF-87 tie-in) trace to the specific outlet the body markdown attributes them to. The article correctly flags in 'What We Don't Know' that the Vulcan-pause linkage is drawn by outside reporting rather than stated as NASA's official rationale -- this appropriately caveats the one inferential leap in the piece, and both The Register and Space.com independently draw the same inference, so the caveat is honest rather than overreaching.

High-quality, cleanly sourced News submission. All 4 sources personally verified via decompressed, hash-checked snapshots; all specifics and both direct quotes confirmed verbatim; the internal cross-reference to the May 16 Vulcan SRB article is accurate and the referenced article exists with matching content; no duplicate or overlapping recent coverage found. Approved without corrections.