Provenance Record

Well-structured News piece at 811 words, comfortably within the 400-1200 range. Clean Overview / What We Know / What We Don't Know / Analysis structure; each major claim is inline-linked to the right source. Prose is tight and readable, and the article correctly distinguishes confirmed facts from open questions (firm launch date, Coronagraph science start, guest-observer allocation, Hubble concurrency).

[{"url":"https://www.nasa.gov/news-release/nasa-to-unveil-complete-roman-telescope-host-media-briefing/","supported_claims":"Confirms April 21, 2026 4 p.m. EDT briefing at Goddard Space Flight Center in Greenbelt, MD; the four named speakers (Isaacman, Fox, Dunn, McEnery) with exactly the titles quoted; the 'fully integrated flagship' framing and 'one of the last opportunities to view' phrasing; that construction is complete and prelaunch testing is wrapping up before shipping to Kennedy Space Center; launch window 'as early as fall' 2026 with official May 2027 deadline. Fully supports every claim attributed to it."},{"url":"https://www.nasa.gov/missions/roman-space-telescope/nasa-completes-nancy-grace-roman-space-telescope-construction/","supported_claims":"Confirms assembly completion date (November 25, 2025) at Goddard's largest clean room; 288-megapixel Wide Field Instrument; 20 petabytes (20,000 terabytes) of data over the five-year primary mission; more than 100,000 exoplanet discoveries and 100,000 transiting worlds, hundreds of millions of stars, billions of galaxies; data rate 'hundreds of times faster than NASA's Hubble Space Telescope'; Coronagraph as technology demonstration blocking stellar glare to image exoplanets. Fully supports every claim attributed to it."},{"url":"https://www.space.com/space-exploration/the-nancy-grace-roman-space-telescope-nasas-next-great-observatory-is-finally-complete","supported_claims":"Confirms SpaceX Falcon Heavy as the launch vehicle; launch 'as early as autumn 2026' ahead of the May 2027 contractual deadline; destination at the second Sun-Earth Lagrange point roughly one million miles from Earth; Julie McEnery's quote 'the most exciting science from Roman is going to be the things that we didn't expect' (verbatim, with the article sensibly trimming the '...that we couldn't predict' tail); Administrator Isaacman's April 21 remarks about surveying capabilities being '1,000 times faster than Hubble' and charting '200 times more sky in a single image,' plus the 'not a screen in existence large enough to show them' line. Fully supports every claim attributed to it."},{"url":"https://www.space.com/astronomy/nasa-reveals-its-roman-space-telescope-today-how-to-watch-live-and-whats-next-for-the-next-generation-observatory","supported_claims":"Confirms the 2.4-meter primary mirror (same diameter as Hubble), Wide Field Instrument field of view roughly 100 times larger than Hubble's, the three-survey science plan (dark energy, Galactic Bulge Time-Domain Survey via gravitational microlensing, general astrophysics), the 'exploits how bent starlight from distant galaxies can allow objects passing in front of massive objects to be temporarily magnified' microlensing description (verbatim), and the more-than-$4-billion total mission cost. Fully supports every claim attributed to it."}]

All dates, figures, speaker titles, and quotes cross-check against the cited sources. The 2.4 m mirror, 288 MP Wide Field Instrument, 20 PB data volume, 100,000+ exoplanets, five-year primary mission, November 25, 2025 assembly date, Falcon Heavy launch, L2 destination one million miles away, and $4 billion cost are all directly attested. Direct quotes from McEnery and Isaacman are verbatim or trimmed accurately without changing meaning. No hallucinations or misattributions detected.

High-quality, well-sourced News piece on a major NASA milestone. All four sources were fetched and verified; every inline claim maps cleanly to a source that supports it. Approved for publication.