Provenance Record

Well-structured News piece (697 words, within the 400-1200 News range). Overview/What We Know/What We Don't Know/Why It Matters scaffolding is clear, the lead is precise, and the article responsibly flags what the reporting does not establish (no measured wind speed, geometry may wander).

All 5 source snapshots read from disk. source-0 (Northwestern news, 200) and source-2 (Sci.News, 200) are full article pages and independently confirm every claim, number, and quote. source-3 (Space.com, 200) confirms the Gorski 'clean enough view' quote, the Murchikova 'quiet state' quote, the 66-antenna/sharpest-image detail, and the near-light-speed/pressure mechanism. source-1 (EurekAlert, status 202) resolved to an AWS WAF anti-bot challenge page rather than article content; source-4 (the primary DOI/ApJL paper, redirected to validate.perfdrive.com) resolved to a Radware bot-manager captcha. Both bot-blocked sources are cited only for facts that are fully corroborated by the two verified full-text snapshots: the DOI is used for the paper title/authors/DOI (verbatim in Sci.News: 'Mark D. Gorski & Lena Murchikova. 2026. The Discovery of an Active Wind from the Milky Way's Central Black Hole. ApJL ...; doi: 10.3847/2041-8213/ae63cf'), and EurekAlert is used for the 100x-deeper/80x-sharper figure, the Chandra X-ray confirmation, and the 20,000-year estimate (all present in both Northwestern and Sci.News). No claim rests solely on an unverifiable snapshot.

Every specific traces to a cited source and matches: 4.3-million-solar-mass (Sci.News), ~1 parsec / ~3 light-years (Northwestern, Sci.News, Space.com), cone-shaped cavity ~1 parsec long and 45 degrees wide (Northwestern, verbatim), 100x deeper / 80x sharper (Northwestern, Sci.News), wind active for at least 20,000 years (Northwestern, Sci.News), five years of ALMA data with 66 radio antennas in northern Chile (Space.com), Chandra X-ray confirmation in the same region (Northwestern, Sci.News). All direct quotes verified verbatim against the snapshots with correct speakers and no conflation: Gorski's 'Unless a black hole exists in a perfect vacuum...', 'With new observations, this is the first time we've had a clean enough view...', and 'It's a huge absence of material. We calculated how much energy was needed to create this cavity'; Murchikova's 'The wind is not powerful, and its direction probably wanders with time', 'The majority of other galaxies spend most of their lives in a state where they are not particularly active', and 'Sgr A* finally gives us a window into the life of a black hole in this quiet state'. The contested exact publication date was correctly OMITTED: the three secondary sources disagree (Northwestern and Space.com say June 4, 2026; Sci.News says June 8, 2026), and the article states only that the paper was 'published in The Astrophysical Journal Letters', avoiding fabrication of a single date. The researcher-name spellings are each correctly attributed: the article writes 'Lena Murchikova' in the paper-authorship sentence sourced to Sci.News (which prints 'Lena Murchikova') and 'Elena Murchikova' in the bio sentence sourced to Northwestern (which prints 'Elena Murchikova'). Both spellings are faithful to their respective cited sources; this is source fidelity, not a conflation or fabrication. 'Sagittarius A*' and 'Sgr A*' are spelled verbatim throughout. The internal cross-reference to the March 2026 ALMA largest-image article resolves to an existing published article.

APPROVE. A clean, well-sourced News article. All specifics, all six direct quotes, and both correctly-attributed name spellings verify against the captured sources; the contested publication date was responsibly omitted rather than fabricated; the internal cross-reference resolves. No corrections are warranted.