Content Quality: Well-structured News piece (Overview / What We Know / What We Don't Know / Analysis). Neutral, factual tone throughout, no sensationalism, no AI self-reference. Word count (1099) is within the News 400-1200 range.
Source Verification: All 4 sources read from local gzip snapshots in sources/2026-07/astronomers-confirm-first-atmosphere-on-a-rocky-exoplanet-in-a-stars-habitable-zone-lhs-1140-b/ (manifest sha256 values re-verified by decompressing and re-hashing each file; all four matched exactly). source-0.html.gz (EarthSky) confirms: 48 ly distance, 1.73 Earth radii / 5.6 Earth masses, LHS 1140 c 'smaller and more heavily irradiated,' Rocky Worlds DDT program description, and the Cherubim/Wordsworth/Charbonneau/Dittmann quotes used elsewhere in the article are consistent with EarthSky's own renderings of the same quotes. source-1.html.gz (Sci.News) confirms: WINERED full expansion verbatim, Magellan Clay Telescope/Las Campanas Observatory, 24.7-day orbital period, 42% stellar irradiation, the full Vissapragada quote block verbatim ('After much careful analysis...' / 'However, our 2025 observations...' / 'It is a rare privilege...'), and the full Dittmann quote verbatim. source-2.html.gz (Astronomy.com) confirms: 6.5m mirror comparison, WINERED resolving power 28,000/70,000 vs Webb NIRSpec's 2,700, the verbatim Cherubim quote 'The James Webb Space Telescope, the resolving power is just at most like a tenth of what this ground-based telescope is,' the tidally-locked day/night/twilight-band claim verbatim, the 'cold trap' quote verbatim, and the verbatim 'but so far to no avail' TRAPPIST-1 fragment. source-3.html.gz (ScienceDaily) confirms: the lead Cherubim quote, the full Charbonneau quote verbatim, the full Wordsworth quote verbatim, the >3-billion-year atmosphere-survival estimate, and the closing Cherubim 'model validation' quote verbatim. Every direct quote in the body traces character-for-character to its cited source; no hallucinated quotes found.
Factual Accuracy: Verified two deliberate omissions the contributor bot flagged in its own research notes, both confirmed as genuine cross-source conflicts rather than fabrication risk: (1) Distance to LHS 1140 — Sci.News states 'approximately 39 light-years away' while EarthSky and ScienceDaily both independently state '48 light-years' and Astronomy.com states 'roughly 50 light-years.' The article correctly uses ~48 ly (the figure corroborated by two of the four sources and closely bracketed by a third) and the string '39 ly'/'39 light' does not appear anywhere in the submitted body_markdown. (2) Equilibrium temperature sign conflict — EarthSky states the equilibrium temperature is 'an estimated equilibrium temperature of 116 degrees Fahrenheit (47 degrees Celsius)' (positive/warm) while Sci.News states 'giving it an equilibrium temperature of 226 K (minus 47 degrees Celsius, or minus 53 degrees Fahrenheit)' (negative/cold) — a literal sign flip on the same magnitude between two sources. The submitted article contains no equilibrium-temperature figure anywhere in the body; the bot correctly dropped the contested figure entirely rather than guessing or silently picking one source. Both omissions reflect sound editorial judgment by the contributor, not oversights requiring correction. All other specifics (radius, mass, orbital period, irradiation percentage, discovery year, instrument name/acronym expansion, telescope/mirror specs, publication date and journal) were independently verified against the snapshots as listed above.
Overall Assessment: Clean, well-sourced News article. The contributor bot's self-reported handling of two cross-source conflicts (the 39 ly distance outlier and the sign-flipped equilibrium temperature) was independently verified against the raw source snapshots and confirmed accurate: both contested figures are correctly absent from the published body, and the distance figure used (~48 ly) is the best-corroborated value across the four sources. All quotes and attributions (Cherubim, Charbonneau, Wordsworth, Vissapragada, Dittmann) verified character-for-character against their cited sources. No duplicate coverage exists. APPROVE.