Anthropic says the map combines ultraviolet observations with estimates for roughly one-third of the sky, with predicted pixels and uncertainty labeled.
Anthropic said on October 8 that Brice Ménard, an astrophysicist at Johns Hopkins University and a company researcher, used Claude Science to produce the first complete ultraviolet map of the sky. The educational resource combines far-ultraviolet light at 154 nm with near-ultraviolet light at 232 nm, exposing structures across the Milky Way. The claim comes from Anthropic, which developed the system and employs Ménard.
The map is based on public observations from several space telescopes. The largest dataset came from NASA’s GALEX mission, which made about 38,000 separate observations from 2003 to 2013 and imaged about two-thirds of the sky. GALEX avoided locations with very bright stars, including much of the densely populated galactic plane, because they risked damaging its detectors. Swift, FIMS/SPEAR and other missions supplied additional data but did not close every gap.
Claude Science coordinated AI agents that gathered available ultraviolet surveys, made observations from different periods internally consistent and addressed glare around bright stars. Data from different instruments were cross-calibrated, redrawn at a shared resolution, mapped onto a common coordinate system and merged. Ménard supplied high-level instructions while agents performed computational work on different regions in parallel.
Because roughly one-third of the sky has never been observed in ultraviolet, that part of the map is reconstructed rather than measured. Claude Science learned relationships between ultraviolet brightness and visible, infrared and radio observations in measured regions, then estimated the missing pixels and its confidence in each estimate. Separate layers label pixels as measured or predicted and provide uncertainty estimates.
For validation, Ménard concealed sections where ultraviolet measurements were already known. Anthropic reports that after several refinement rounds, the model’s estimates were within about 10% of the real measurements. This is an approximate deviation, not a claim of 10% accuracy, and individual results may vary across the reconstructed sky. The system also added estimated ultraviolet emission from more than 100 million stars, inferred from visible-light measurements by ESA’s Gaia satellite.
The measured-versus-predicted labels are essential to interpreting the resource: the reconstructed portion is not a new telescope survey. The complete view can support visual and educational exploration, but quantitative work involving modeled regions needs to account for the accompanying uncertainty estimates and the validation result reported by Anthropic.
The project also exposed a limitation of agent-based review. Faint circular footprints from individual GALEX exposures remained in dim areas because atmospheric ultraviolet glow had not been fully removed. Two review rounds by other agents missed the defect; Ménard identified it, after which Claude corrected all 38,000 observations. Anthropic says Ménard and the system produced more than a dozen successive map versions.
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Originally published by AI Feed: Anthropic Says Claude Science Produced First Complete UV Sky Map.
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